drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/idr.h>
  25 #include <asm/unaligned.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/iscsi_proto.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_fabric.h>
  31 #include <target/target_core_configfs.h>
  32
  33 #include "iscsi_target_core.h"
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_tq.h"
  37 #include "iscsi_target_configfs.h"
  38 #include "iscsi_target_datain_values.h"
  39 #include "iscsi_target_erl0.h"
  40 #include "iscsi_target_erl1.h"
  41 #include "iscsi_target_erl2.h"
  42 #include "iscsi_target_login.h"
  43 #include "iscsi_target_tmr.h"
  44 #include "iscsi_target_tpg.h"
  45 #include "iscsi_target_util.h"
  46 #include "iscsi_target.h"
  47 #include "iscsi_target_device.h"
  48 #include "iscsi_target_stat.h"
  49
  50 #include <target/iscsi/iscsi_transport.h>
  51
  52 static LIST_HEAD(g_tiqn_list);
  53 static LIST_HEAD(g_np_list);
  54 static DEFINE_SPINLOCK(tiqn_lock);
  55 static DEFINE_MUTEX(np_lock);
  56
  57 static struct idr tiqn_idr;
  58 struct idr sess_idr;
  59 struct mutex auth_id_lock;
  60 spinlock_t sess_idr_lock;
  61
  62 struct iscsit_global *iscsit_global;
  63
  64 struct kmem_cache *lio_qr_cache;
  65 struct kmem_cache *lio_dr_cache;
  66 struct kmem_cache *lio_ooo_cache;
  67 struct kmem_cache *lio_r2t_cache;
  68
  69 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  70                         struct iscsi_scsi_req *, u32);
  71
  72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  73 {
  74         struct iscsi_tiqn *tiqn = NULL;
  75
  76         spin_lock(&tiqn_lock);
  77         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  78                 if (!strcmp(tiqn->tiqn, buf)) {
  79
  80                         spin_lock(&tiqn->tiqn_state_lock);
  81                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  82                                 tiqn->tiqn_access_count++;
  83                                 spin_unlock(&tiqn->tiqn_state_lock);
  84                                 spin_unlock(&tiqn_lock);
  85                                 return tiqn;
  86                         }
  87                         spin_unlock(&tiqn->tiqn_state_lock);
  88                 }
  89         }
  90         spin_unlock(&tiqn_lock);
  91
  92         return NULL;
  93 }
  94
  95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  96 {
  97         spin_lock(&tiqn->tiqn_state_lock);
  98         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  99                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 100                 spin_unlock(&tiqn->tiqn_state_lock);
 101                 return 0;
 102         }
 103         spin_unlock(&tiqn->tiqn_state_lock);
 104
 105         return -1;
 106 }
 107
 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 109 {
 110         spin_lock(&tiqn->tiqn_state_lock);
 111         tiqn->tiqn_access_count--;
 112         spin_unlock(&tiqn->tiqn_state_lock);
 113 }
 114
 115 /*
 116  * Note that IQN formatting is expected to be done in userspace, and
 117  * no explict IQN format checks are done here.
 118  */
 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 120 {
 121         struct iscsi_tiqn *tiqn = NULL;
 122         int ret;
 123
 124         if (strlen(buf) >= ISCSI_IQN_LEN) {
 125                 pr_err("Target IQN exceeds %d bytes\n",
 126                                 ISCSI_IQN_LEN);
 127                 return ERR_PTR(-EINVAL);
 128         }
 129
 130         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 131         if (!tiqn) {
 132                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 133                 return ERR_PTR(-ENOMEM);
 134         }
 135
 136         sprintf(tiqn->tiqn, "%s", buf);
 137         INIT_LIST_HEAD(&tiqn->tiqn_list);
 138         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 139         spin_lock_init(&tiqn->tiqn_state_lock);
 140         spin_lock_init(&tiqn->tiqn_tpg_lock);
 141         spin_lock_init(&tiqn->sess_err_stats.lock);
 142         spin_lock_init(&tiqn->login_stats.lock);
 143         spin_lock_init(&tiqn->logout_stats.lock);
 144
 145         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 146
 147         idr_preload(GFP_KERNEL);
 148         spin_lock(&tiqn_lock);
 149
 150         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 151         if (ret < 0) {
 152                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 153                 spin_unlock(&tiqn_lock);
 154                 idr_preload_end();
 155                 kfree(tiqn);
 156                 return ERR_PTR(ret);
 157         }
 158         tiqn->tiqn_index = ret;
 159         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 160
 161         spin_unlock(&tiqn_lock);
 162         idr_preload_end();
 163
 164         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 165
 166         return tiqn;
 167
 168 }
 169
 170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 171 {
 172         /*
 173          * Wait for accesses to said struct iscsi_tiqn to end.
 174          */
 175         spin_lock(&tiqn->tiqn_state_lock);
 176         while (tiqn->tiqn_access_count != 0) {
 177                 spin_unlock(&tiqn->tiqn_state_lock);
 178                 msleep(10);
 179                 spin_lock(&tiqn->tiqn_state_lock);
 180         }
 181         spin_unlock(&tiqn->tiqn_state_lock);
 182 }
 183
 184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 185 {
 186         /*
 187          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 188          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 189          * attempts to access this struct iscsi_tiqn will fail from both transport
 190          * fabric and control code paths.
 191          */
 192         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 193                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 194                 return;
 195         }
 196
 197         iscsit_wait_for_tiqn(tiqn);
 198
 199         spin_lock(&tiqn_lock);
 200         list_del(&tiqn->tiqn_list);
 201         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 202         spin_unlock(&tiqn_lock);
 203
 204         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 205                         tiqn->tiqn);
 206         kfree(tiqn);
 207 }
 208
 209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 210 {
 211         int ret;
 212         /*
 213          * Determine if the network portal is accepting storage traffic.
 214          */
 215         spin_lock_bh(&np->np_thread_lock);
 216         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 217                 spin_unlock_bh(&np->np_thread_lock);
 218                 return -1;
 219         }
 220         spin_unlock_bh(&np->np_thread_lock);
 221         /*
 222          * Determine if the portal group is accepting storage traffic.
 223          */
 224         spin_lock_bh(&tpg->tpg_state_lock);
 225         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 226                 spin_unlock_bh(&tpg->tpg_state_lock);
 227                 return -1;
 228         }
 229         spin_unlock_bh(&tpg->tpg_state_lock);
 230
 231         /*
 232          * Here we serialize access across the TIQN+TPG Tuple.
 233          */
 234         ret = down_interruptible(&tpg->np_login_sem);
 235         if ((ret != 0) || signal_pending(current))
 236                 return -1;
 237
 238         spin_lock_bh(&tpg->tpg_state_lock);
 239         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 240                 spin_unlock_bh(&tpg->tpg_state_lock);
 241                 up(&tpg->np_login_sem);
 242                 return -1;
 243         }
 244         spin_unlock_bh(&tpg->tpg_state_lock);
 245
 246         return 0;
 247 }
 248
 249 void iscsit_login_kref_put(struct kref *kref)
 250 {
 251         struct iscsi_tpg_np *tpg_np = container_of(kref,
 252                                 struct iscsi_tpg_np, tpg_np_kref);
 253
 254         complete(&tpg_np->tpg_np_comp);
 255 }
 256
 257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 258                        struct iscsi_tpg_np *tpg_np)
 259 {
 260         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 261
 262         up(&tpg->np_login_sem);
 263
 264         if (tpg_np)
 265                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 266
 267         if (tiqn)
 268                 iscsit_put_tiqn_for_login(tiqn);
 269
 270         return 0;
 271 }
 272
 273 bool iscsit_check_np_match(
 274         struct __kernel_sockaddr_storage *sockaddr,
 275         struct iscsi_np *np,
 276         int network_transport)
 277 {
 278         struct sockaddr_in *sock_in, *sock_in_e;
 279         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 280         bool ip_match = false;
 281         u16 port;
 282
 283         if (sockaddr->ss_family == AF_INET6) {
 284                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 285                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 286
 287                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 288                             &sock_in6_e->sin6_addr.in6_u,
 289                             sizeof(struct in6_addr)))
 290                         ip_match = true;
 291
 292                 port = ntohs(sock_in6->sin6_port);
 293         } else {
 294                 sock_in = (struct sockaddr_in *)sockaddr;
 295                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 298                         ip_match = true;
 299
 300                 port = ntohs(sock_in->sin_port);
 301         }
 302
 303         if ((ip_match == true) && (np->np_port == port) &&
 304             (np->np_network_transport == network_transport))
 305                 return true;
 306
 307         return false;
 308 }
 309
 310 /*
 311  * Called with mutex np_lock held
 312  */
 313 static struct iscsi_np *iscsit_get_np(
 314         struct __kernel_sockaddr_storage *sockaddr,
 315         int network_transport)
 316 {
 317         struct iscsi_np *np;
 318         bool match;
 319
 320         list_for_each_entry(np, &g_np_list, np_list) {
 321                 spin_lock_bh(&np->np_thread_lock);
 322                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 323                         spin_unlock_bh(&np->np_thread_lock);
 324                         continue;
 325                 }
 326
 327                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 328                 if (match == true) {
 329                         /*
 330                          * Increment the np_exports reference count now to
 331                          * prevent iscsit_del_np() below from being called
 332                          * while iscsi_tpg_add_network_portal() is called.
 333                          */
 334                         np->np_exports++;
 335                         spin_unlock_bh(&np->np_thread_lock);
 336                         return np;
 337                 }
 338                 spin_unlock_bh(&np->np_thread_lock);
 339         }
 340
 341         return NULL;
 342 }
 343
 344 struct iscsi_np *iscsit_add_np(
 345         struct __kernel_sockaddr_storage *sockaddr,
 346         char *ip_str,
 347         int network_transport)
 348 {
 349         struct sockaddr_in *sock_in;
 350         struct sockaddr_in6 *sock_in6;
 351         struct iscsi_np *np;
 352         int ret;
 353
 354         mutex_lock(&np_lock);
 355
 356         /*
 357          * Locate the existing struct iscsi_np if already active..
 358          */
 359         np = iscsit_get_np(sockaddr, network_transport);
 360         if (np) {
 361                 mutex_unlock(&np_lock);
 362                 return np;
 363         }
 364
 365         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 366         if (!np) {
 367                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 368                 mutex_unlock(&np_lock);
 369                 return ERR_PTR(-ENOMEM);
 370         }
 371
 372         np->np_flags |= NPF_IP_NETWORK;
 373         if (sockaddr->ss_family == AF_INET6) {
 374                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 375                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 376                 np->np_port = ntohs(sock_in6->sin6_port);
 377         } else {
 378                 sock_in = (struct sockaddr_in *)sockaddr;
 379                 sprintf(np->np_ip, "%s", ip_str);
 380                 np->np_port = ntohs(sock_in->sin_port);
 381         }
 382
 383         np->np_network_transport = network_transport;
 384         spin_lock_init(&np->np_thread_lock);
 385         init_completion(&np->np_restart_comp);
 386         INIT_LIST_HEAD(&np->np_list);
 387
 388         ret = iscsi_target_setup_login_socket(np, sockaddr);
 389         if (ret != 0) {
 390                 kfree(np);
 391                 mutex_unlock(&np_lock);
 392                 return ERR_PTR(ret);
 393         }
 394
 395         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 396         if (IS_ERR(np->np_thread)) {
 397                 pr_err("Unable to create kthread: iscsi_np\n");
 398                 ret = PTR_ERR(np->np_thread);
 399                 kfree(np);
 400                 mutex_unlock(&np_lock);
 401                 return ERR_PTR(ret);
 402         }
 403         /*
 404          * Increment the np_exports reference count now to prevent
 405          * iscsit_del_np() below from being run while a new call to
 406          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 407          * active.  We don't need to hold np->np_thread_lock at this
 408          * point because iscsi_np has not been added to g_np_list yet.
 409          */
 410         np->np_exports = 1;
 411         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 412
 413         list_add_tail(&np->np_list, &g_np_list);
 414         mutex_unlock(&np_lock);
 415
 416         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 417                 np->np_ip, np->np_port, np->np_transport->name);
 418
 419         return np;
 420 }
 421
 422 int iscsit_reset_np_thread(
 423         struct iscsi_np *np,
 424         struct iscsi_tpg_np *tpg_np,
 425         struct iscsi_portal_group *tpg,
 426         bool shutdown)
 427 {
 428         spin_lock_bh(&np->np_thread_lock);
 429         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 430                 spin_unlock_bh(&np->np_thread_lock);
 431                 return 0;
 432         }
 433         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 434
 435         if (np->np_thread) {
 436                 spin_unlock_bh(&np->np_thread_lock);
 437                 send_sig(SIGINT, np->np_thread, 1);
 438                 wait_for_completion(&np->np_restart_comp);
 439                 spin_lock_bh(&np->np_thread_lock);
 440         }
 441         spin_unlock_bh(&np->np_thread_lock);
 442
 443         if (tpg_np && shutdown) {
 444                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 445
 446                 wait_for_completion(&tpg_np->tpg_np_comp);
 447         }
 448
 449         return 0;
 450 }
 451
 452 static void iscsit_free_np(struct iscsi_np *np)
 453 {
 454         if (np->np_socket)
 455                 sock_release(np->np_socket);
 456 }
 457
 458 int iscsit_del_np(struct iscsi_np *np)
 459 {
 460         spin_lock_bh(&np->np_thread_lock);
 461         np->np_exports--;
 462         if (np->np_exports) {
 463                 spin_unlock_bh(&np->np_thread_lock);
 464                 return 0;
 465         }
 466         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 467         spin_unlock_bh(&np->np_thread_lock);
 468
 469         if (np->np_thread) {
 470                 /*
 471                  * We need to send the signal to wakeup Linux/Net
 472                  * which may be sleeping in sock_accept()..
 473                  */
 474                 send_sig(SIGINT, np->np_thread, 1);
 475                 kthread_stop(np->np_thread);
 476                 np->np_thread = NULL;
 477         }
 478
 479         np->np_transport->iscsit_free_np(np);
 480
 481         mutex_lock(&np_lock);
 482         list_del(&np->np_list);
 483         mutex_unlock(&np_lock);
 484
 485         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 486                 np->np_ip, np->np_port, np->np_transport->name);
 487
 488         iscsit_put_transport(np->np_transport);
 489         kfree(np);
 490         return 0;
 491 }
 492
 493 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 494 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 495
 496 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 497 {
 498         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 499         return 0;
 500 }
 501
 502 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 503 {
 504         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 505
 506         spin_lock_bh(&conn->cmd_lock);
 507         if (!list_empty(&cmd->i_conn_node))
 508                 list_del_init(&cmd->i_conn_node);
 509         spin_unlock_bh(&conn->cmd_lock);
 510
 511         __iscsit_free_cmd(cmd, scsi_cmd, true);
 512 }
 513
 514 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 515 {
 516         return TARGET_PROT_NORMAL;
 517 }
 518
 519 static struct iscsit_transport iscsi_target_transport = {
 520         .name                   = "iSCSI/TCP",
 521         .transport_type         = ISCSI_TCP,
 522         .owner                  = NULL,
 523         .iscsit_setup_np        = iscsit_setup_np,
 524         .iscsit_accept_np       = iscsit_accept_np,
 525         .iscsit_free_np         = iscsit_free_np,
 526         .iscsit_get_login_rx    = iscsit_get_login_rx,
 527         .iscsit_put_login_tx    = iscsit_put_login_tx,
 528         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 529         .iscsit_immediate_queue = iscsit_immediate_queue,
 530         .iscsit_response_queue  = iscsit_response_queue,
 531         .iscsit_queue_data_in   = iscsit_queue_rsp,
 532         .iscsit_queue_status    = iscsit_queue_rsp,
 533         .iscsit_aborted_task    = iscsit_aborted_task,
 534         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 535 };
 536
 537 static int __init iscsi_target_init_module(void)
 538 {
 539         int ret = 0;
 540
 541         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 542
 543         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 544         if (!iscsit_global) {
 545                 pr_err("Unable to allocate memory for iscsit_global\n");
 546                 return -1;
 547         }
 548         mutex_init(&auth_id_lock);
 549         spin_lock_init(&sess_idr_lock);
 550         idr_init(&tiqn_idr);
 551         idr_init(&sess_idr);
 552
 553         ret = iscsi_target_register_configfs();
 554         if (ret < 0)
 555                 goto out;
 556
 557         ret = iscsi_thread_set_init();
 558         if (ret < 0)
 559                 goto configfs_out;
 560
 561         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 562                         TARGET_THREAD_SET_COUNT) {
 563                 pr_err("iscsi_allocate_thread_sets() returned"
 564                         " unexpected value!\n");
 565                 goto ts_out1;
 566         }
 567
 568         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 569                         sizeof(struct iscsi_queue_req),
 570                         __alignof__(struct iscsi_queue_req), 0, NULL);
 571         if (!lio_qr_cache) {
 572                 pr_err("nable to kmem_cache_create() for"
 573                                 " lio_qr_cache\n");
 574                 goto ts_out2;
 575         }
 576
 577         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 578                         sizeof(struct iscsi_datain_req),
 579                         __alignof__(struct iscsi_datain_req), 0, NULL);
 580         if (!lio_dr_cache) {
 581                 pr_err("Unable to kmem_cache_create() for"
 582                                 " lio_dr_cache\n");
 583                 goto qr_out;
 584         }
 585
 586         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 587                         sizeof(struct iscsi_ooo_cmdsn),
 588                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 589         if (!lio_ooo_cache) {
 590                 pr_err("Unable to kmem_cache_create() for"
 591                                 " lio_ooo_cache\n");
 592                 goto dr_out;
 593         }
 594
 595         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 596                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 597                         0, NULL);
 598         if (!lio_r2t_cache) {
 599                 pr_err("Unable to kmem_cache_create() for"
 600                                 " lio_r2t_cache\n");
 601                 goto ooo_out;
 602         }
 603
 604         iscsit_register_transport(&iscsi_target_transport);
 605
 606         if (iscsit_load_discovery_tpg() < 0)
 607                 goto r2t_out;
 608
 609         return ret;
 610 r2t_out:
 611         kmem_cache_destroy(lio_r2t_cache);
 612 ooo_out:
 613         kmem_cache_destroy(lio_ooo_cache);
 614 dr_out:
 615         kmem_cache_destroy(lio_dr_cache);
 616 qr_out:
 617         kmem_cache_destroy(lio_qr_cache);
 618 ts_out2:
 619         iscsi_deallocate_thread_sets();
 620 ts_out1:
 621         iscsi_thread_set_free();
 622 configfs_out:
 623         iscsi_target_deregister_configfs();
 624 out:
 625         kfree(iscsit_global);
 626         return -ENOMEM;
 627 }
 628
 629 static void __exit iscsi_target_cleanup_module(void)
 630 {
 631         iscsi_deallocate_thread_sets();
 632         iscsi_thread_set_free();
 633         iscsit_release_discovery_tpg();
 634         iscsit_unregister_transport(&iscsi_target_transport);
 635         kmem_cache_destroy(lio_qr_cache);
 636         kmem_cache_destroy(lio_dr_cache);
 637         kmem_cache_destroy(lio_ooo_cache);
 638         kmem_cache_destroy(lio_r2t_cache);
 639
 640         iscsi_target_deregister_configfs();
 641
 642         kfree(iscsit_global);
 643 }
 644
 645 static int iscsit_add_reject(
 646         struct iscsi_conn *conn,
 647         u8 reason,
 648         unsigned char *buf)
 649 {
 650         struct iscsi_cmd *cmd;
 651
 652         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 653         if (!cmd)
 654                 return -1;
 655
 656         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 657         cmd->reject_reason = reason;
 658
 659         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 660         if (!cmd->buf_ptr) {
 661                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 662                 iscsit_free_cmd(cmd, false);
 663                 return -1;
 664         }
 665
 666         spin_lock_bh(&conn->cmd_lock);
 667         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 668         spin_unlock_bh(&conn->cmd_lock);
 669
 670         cmd->i_state = ISTATE_SEND_REJECT;
 671         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 672
 673         return -1;
 674 }
 675
 676 static int iscsit_add_reject_from_cmd(
 677         struct iscsi_cmd *cmd,
 678         u8 reason,
 679         bool add_to_conn,
 680         unsigned char *buf)
 681 {
 682         struct iscsi_conn *conn;
 683
 684         if (!cmd->conn) {
 685                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 686                                 cmd->init_task_tag);
 687                 return -1;
 688         }
 689         conn = cmd->conn;
 690
 691         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 692         cmd->reject_reason = reason;
 693
 694         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 695         if (!cmd->buf_ptr) {
 696                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 697                 iscsit_free_cmd(cmd, false);
 698                 return -1;
 699         }
 700
 701         if (add_to_conn) {
 702                 spin_lock_bh(&conn->cmd_lock);
 703                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 704                 spin_unlock_bh(&conn->cmd_lock);
 705         }
 706
 707         cmd->i_state = ISTATE_SEND_REJECT;
 708         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 709         /*
 710          * Perform the kref_put now if se_cmd has already been setup by
 711          * scsit_setup_scsi_cmd()
 712          */
 713         if (cmd->se_cmd.se_tfo != NULL) {
 714                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 715                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 716         }
 717         return -1;
 718 }
 719
 720 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 721                                  unsigned char *buf)
 722 {
 723         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 724 }
 725
 726 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 727 {
 728         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 729 }
 730
 731 /*
 732  * Map some portion of the allocated scatterlist to an iovec, suitable for
 733  * kernel sockets to copy data in/out.
 734  */
 735 static int iscsit_map_iovec(
 736         struct iscsi_cmd *cmd,
 737         struct kvec *iov,
 738         u32 data_offset,
 739         u32 data_length)
 740 {
 741         u32 i = 0;
 742         struct scatterlist *sg;
 743         unsigned int page_off;
 744
 745         /*
 746          * We know each entry in t_data_sg contains a page.
 747          */
 748         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 749         page_off = (data_offset % PAGE_SIZE);
 750
 751         cmd->first_data_sg = sg;
 752         cmd->first_data_sg_off = page_off;
 753
 754         while (data_length) {
 755                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 756
 757                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 758                 iov[i].iov_len = cur_len;
 759
 760                 data_length -= cur_len;
 761                 page_off = 0;
 762                 sg = sg_next(sg);
 763                 i++;
 764         }
 765
 766         cmd->kmapped_nents = i;
 767
 768         return i;
 769 }
 770
 771 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 772 {
 773         u32 i;
 774         struct scatterlist *sg;
 775
 776         sg = cmd->first_data_sg;
 777
 778         for (i = 0; i < cmd->kmapped_nents; i++)
 779                 kunmap(sg_page(&sg[i]));
 780 }
 781
 782 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 783 {
 784         LIST_HEAD(ack_list);
 785         struct iscsi_cmd *cmd, *cmd_p;
 786
 787         conn->exp_statsn = exp_statsn;
 788
 789         if (conn->sess->sess_ops->RDMAExtensions)
 790                 return;
 791
 792         spin_lock_bh(&conn->cmd_lock);
 793         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 794                 spin_lock(&cmd->istate_lock);
 795                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 796                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 797                         cmd->i_state = ISTATE_REMOVE;
 798                         spin_unlock(&cmd->istate_lock);
 799                         list_move_tail(&cmd->i_conn_node, &ack_list);
 800                         continue;
 801                 }
 802                 spin_unlock(&cmd->istate_lock);
 803         }
 804         spin_unlock_bh(&conn->cmd_lock);
 805
 806         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 807                 list_del_init(&cmd->i_conn_node);
 808                 iscsit_free_cmd(cmd, false);
 809         }
 810 }
 811
 812 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 813 {
 814         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 815
 816         iov_count += ISCSI_IOV_DATA_BUFFER;
 817
 818         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 819         if (!cmd->iov_data) {
 820                 pr_err("Unable to allocate cmd->iov_data\n");
 821                 return -ENOMEM;
 822         }
 823
 824         cmd->orig_iov_data_count = iov_count;
 825         return 0;
 826 }
 827
 828 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 829                           unsigned char *buf)
 830 {
 831         int data_direction, payload_length;
 832         struct iscsi_scsi_req *hdr;
 833         int iscsi_task_attr;
 834         int sam_task_attr;
 835
 836         atomic_long_inc(&conn->sess->cmd_pdus);
 837
 838         hdr                     = (struct iscsi_scsi_req *) buf;
 839         payload_length          = ntoh24(hdr->dlength);
 840
 841         /* FIXME; Add checks for AdditionalHeaderSegment */
 842
 843         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 844             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 845                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 846                                 " not set. Bad iSCSI Initiator.\n");
 847                 return iscsit_add_reject_cmd(cmd,
 848                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 849         }
 850
 851         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 852              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 853                 /*
 854                  * From RFC-3720 Section 10.3.1:
 855                  *
 856                  * "Either or both of R and W MAY be 1 when either the
 857                  *  Expected Data Transfer Length and/or Bidirectional Read
 858                  *  Expected Data Transfer Length are 0"
 859                  *
 860                  * For this case, go ahead and clear the unnecssary bits
 861                  * to avoid any confusion with ->data_direction.
 862                  */
 863                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 864                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 865
 866                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 867                         " set when Expected Data Transfer Length is 0 for"
 868                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 869         }
 870
 871         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 872             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 873                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 874                         " MUST be set if Expected Data Transfer Length is not 0."
 875                         " Bad iSCSI Initiator\n");
 876                 return iscsit_add_reject_cmd(cmd,
 877                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 878         }
 879
 880         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 881             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 882                 pr_err("Bidirectional operations not supported!\n");
 883                 return iscsit_add_reject_cmd(cmd,
 884                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 885         }
 886
 887         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 888                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 889                                 " Scsi Command PDU.\n");
 890                 return iscsit_add_reject_cmd(cmd,
 891                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 892         }
 893
 894         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 895                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 896                         " protocol error.\n", payload_length);
 897                 return iscsit_add_reject_cmd(cmd,
 898                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 899         }
 900
 901         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 902             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 903                 pr_err("Expected Data Transfer Length and Length of"
 904                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 905                         " bit is not set protocol error\n");
 906                 return iscsit_add_reject_cmd(cmd,
 907                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 908         }
 909
 910         if (payload_length > be32_to_cpu(hdr->data_length)) {
 911                 pr_err("DataSegmentLength: %u is greater than"
 912                         " EDTL: %u, protocol error.\n", payload_length,
 913                                 hdr->data_length);
 914                 return iscsit_add_reject_cmd(cmd,
 915                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 916         }
 917
 918         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 919                 pr_err("DataSegmentLength: %u is greater than"
 920                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 921                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 922                 return iscsit_add_reject_cmd(cmd,
 923                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 924         }
 925
 926         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 927                 pr_err("DataSegmentLength: %u is greater than"
 928                         " FirstBurstLength: %u, protocol error.\n",
 929                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 930                 return iscsit_add_reject_cmd(cmd,
 931                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 932         }
 933
 934         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 935                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 936                           DMA_NONE;
 937
 938         cmd->data_direction = data_direction;
 939         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 940         /*
 941          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 942          */
 943         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 944             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 945                 sam_task_attr = MSG_SIMPLE_TAG;
 946         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 947                 sam_task_attr = MSG_ORDERED_TAG;
 948         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 949                 sam_task_attr = MSG_HEAD_TAG;
 950         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 951                 sam_task_attr = MSG_ACA_TAG;
 952         else {
 953                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 954                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 955                 sam_task_attr = MSG_SIMPLE_TAG;
 956         }
 957
 958         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 959         cmd->i_state            = ISTATE_NEW_CMD;
 960         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 961         cmd->immediate_data     = (payload_length) ? 1 : 0;
 962         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 963                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 964         if (cmd->unsolicited_data)
 965                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 966
 967         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 968         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 969                 spin_lock_bh(&conn->sess->ttt_lock);
 970                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 971                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 972                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 973                 spin_unlock_bh(&conn->sess->ttt_lock);
 974         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 975                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 976         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 977         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 978         cmd->first_burst_len    = payload_length;
 979
 980         if (!conn->sess->sess_ops->RDMAExtensions &&
 981              cmd->data_direction == DMA_FROM_DEVICE) {
 982                 struct iscsi_datain_req *dr;
 983
 984                 dr = iscsit_allocate_datain_req();
 985                 if (!dr)
 986                         return iscsit_add_reject_cmd(cmd,
 987                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 988
 989                 iscsit_attach_datain_req(cmd, dr);
 990         }
 991
 992         /*
 993          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 994          */
 995         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 996                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 997                         cmd->data_direction, sam_task_attr,
 998                         cmd->sense_buffer + 2);
 999
1000         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1001                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1002                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1003                 conn->cid);
1004
1005         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1006
1007         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1008                                                      scsilun_to_int(&hdr->lun));
1009         if (cmd->sense_reason)
1010                 goto attach_cmd;
1011
1012         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1013         if (cmd->sense_reason) {
1014                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1015                         return iscsit_add_reject_cmd(cmd,
1016                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1017                 }
1018
1019                 goto attach_cmd;
1020         }
1021
1022         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1023                 return iscsit_add_reject_cmd(cmd,
1024                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1025         }
1026
1027 attach_cmd:
1028         spin_lock_bh(&conn->cmd_lock);
1029         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1030         spin_unlock_bh(&conn->cmd_lock);
1031         /*
1032          * Check if we need to delay processing because of ALUA
1033          * Active/NonOptimized primary access state..
1034          */
1035         core_alua_check_nonop_delay(&cmd->se_cmd);
1036
1037         return 0;
1038 }
1039 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1040
1041 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1042 {
1043         iscsit_set_dataout_sequence_values(cmd);
1044
1045         spin_lock_bh(&cmd->dataout_timeout_lock);
1046         iscsit_start_dataout_timer(cmd, cmd->conn);
1047         spin_unlock_bh(&cmd->dataout_timeout_lock);
1048 }
1049 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1050
1051 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1052                             struct iscsi_scsi_req *hdr)
1053 {
1054         int cmdsn_ret = 0;
1055         /*
1056          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1057          * the Immediate Bit is not set, and no Immediate
1058          * Data is attached.
1059          *
1060          * A PDU/CmdSN carrying Immediate Data can only
1061          * be processed after the DataCRC has passed.
1062          * If the DataCRC fails, the CmdSN MUST NOT
1063          * be acknowledged. (See below)
1064          */
1065         if (!cmd->immediate_data) {
1066                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1067                                         (unsigned char *)hdr, hdr->cmdsn);
1068                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1069                         return -1;
1070                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1071                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1072                         return 0;
1073                 }
1074         }
1075
1076         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1077
1078         /*
1079          * If no Immediate Data is attached, it's OK to return now.
1080          */
1081         if (!cmd->immediate_data) {
1082                 if (!cmd->sense_reason && cmd->unsolicited_data)
1083                         iscsit_set_unsoliticed_dataout(cmd);
1084                 if (!cmd->sense_reason)
1085                         return 0;
1086
1087                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1088                 return 0;
1089         }
1090
1091         /*
1092          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1093          * execution.  These exceptions are processed in CmdSN order using
1094          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1095          */
1096         if (cmd->sense_reason) {
1097                 if (cmd->reject_reason)
1098                         return 0;
1099
1100                 return 1;
1101         }
1102         /*
1103          * Call directly into transport_generic_new_cmd() to perform
1104          * the backend memory allocation.
1105          */
1106         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1107         if (cmd->sense_reason)
1108                 return 1;
1109
1110         return 0;
1111 }
1112 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1113
1114 static int
1115 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1116                           bool dump_payload)
1117 {
1118         struct iscsi_conn *conn = cmd->conn;
1119         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1120         /*
1121          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1122          */
1123         if (dump_payload == true)
1124                 goto after_immediate_data;
1125
1126         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1127                                         cmd->first_burst_len);
1128 after_immediate_data:
1129         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1130                 /*
1131                  * A PDU/CmdSN carrying Immediate Data passed
1132                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1133                  * Immediate Bit is not set.
1134                  */
1135                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1136                                         (unsigned char *)hdr, hdr->cmdsn);
1137                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1138                         return -1;
1139
1140                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1141                         int rc;
1142
1143                         rc = iscsit_dump_data_payload(cmd->conn,
1144                                                       cmd->first_burst_len, 1);
1145                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1146                         return rc;
1147                 } else if (cmd->unsolicited_data)
1148                         iscsit_set_unsoliticed_dataout(cmd);
1149
1150         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1151                 /*
1152                  * Immediate Data failed DataCRC and ERL>=1,
1153                  * silently drop this PDU and let the initiator
1154                  * plug the CmdSN gap.
1155                  *
1156                  * FIXME: Send Unsolicited NOPIN with reserved
1157                  * TTT here to help the initiator figure out
1158                  * the missing CmdSN, although they should be
1159                  * intelligent enough to determine the missing
1160                  * CmdSN and issue a retry to plug the sequence.
1161                  */
1162                 cmd->i_state = ISTATE_REMOVE;
1163                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1164         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1165                 return -1;
1166
1167         return 0;
1168 }
1169
1170 static int
1171 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1172                            unsigned char *buf)
1173 {
1174         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1175         int rc, immed_data;
1176         bool dump_payload = false;
1177
1178         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1179         if (rc < 0)
1180                 return 0;
1181         /*
1182          * Allocation iovecs needed for struct socket operations for
1183          * traditional iSCSI block I/O.
1184          */
1185         if (iscsit_allocate_iovecs(cmd) < 0) {
1186                 return iscsit_add_reject_cmd(cmd,
1187                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1188         }
1189         immed_data = cmd->immediate_data;
1190
1191         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1192         if (rc < 0)
1193                 return rc;
1194         else if (rc > 0)
1195                 dump_payload = true;
1196
1197         if (!immed_data)
1198                 return 0;
1199
1200         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1201 }
1202
1203 static u32 iscsit_do_crypto_hash_sg(
1204         struct hash_desc *hash,
1205         struct iscsi_cmd *cmd,
1206         u32 data_offset,
1207         u32 data_length,
1208         u32 padding,
1209         u8 *pad_bytes)
1210 {
1211         u32 data_crc;
1212         u32 i;
1213         struct scatterlist *sg;
1214         unsigned int page_off;
1215
1216         crypto_hash_init(hash);
1217
1218         sg = cmd->first_data_sg;
1219         page_off = cmd->first_data_sg_off;
1220
1221         i = 0;
1222         while (data_length) {
1223                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1224
1225                 crypto_hash_update(hash, &sg[i], cur_len);
1226
1227                 data_length -= cur_len;
1228                 page_off = 0;
1229                 i++;
1230         }
1231
1232         if (padding) {
1233                 struct scatterlist pad_sg;
1234
1235                 sg_init_one(&pad_sg, pad_bytes, padding);
1236                 crypto_hash_update(hash, &pad_sg, padding);
1237         }
1238         crypto_hash_final(hash, (u8 *) &data_crc);
1239
1240         return data_crc;
1241 }
1242
1243 static void iscsit_do_crypto_hash_buf(
1244         struct hash_desc *hash,
1245         const void *buf,
1246         u32 payload_length,
1247         u32 padding,
1248         u8 *pad_bytes,
1249         u8 *data_crc)
1250 {
1251         struct scatterlist sg;
1252
1253         crypto_hash_init(hash);
1254
1255         sg_init_one(&sg, buf, payload_length);
1256         crypto_hash_update(hash, &sg, payload_length);
1257
1258         if (padding) {
1259                 sg_init_one(&sg, pad_bytes, padding);
1260                 crypto_hash_update(hash, &sg, padding);
1261         }
1262         crypto_hash_final(hash, data_crc);
1263 }
1264
1265 int
1266 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1267                           struct iscsi_cmd **out_cmd)
1268 {
1269         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1270         struct iscsi_cmd *cmd = NULL;
1271         struct se_cmd *se_cmd;
1272         u32 payload_length = ntoh24(hdr->dlength);
1273         int rc;
1274
1275         if (!payload_length) {
1276                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1277                 return 0;
1278         }
1279
1280         /* iSCSI write */
1281         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1282
1283         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1284                 pr_err("DataSegmentLength: %u is greater than"
1285                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1286                         conn->conn_ops->MaxXmitDataSegmentLength);
1287                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1288                                          buf);
1289         }
1290
1291         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1292                         payload_length);
1293         if (!cmd)
1294                 return 0;
1295
1296         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1297                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1298                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1299                 payload_length, conn->cid);
1300
1301         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1302                 pr_err("Command ITT: 0x%08x received DataOUT after"
1303                         " last DataOUT received, dumping payload\n",
1304                         cmd->init_task_tag);
1305                 return iscsit_dump_data_payload(conn, payload_length, 1);
1306         }
1307
1308         if (cmd->data_direction != DMA_TO_DEVICE) {
1309                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1310                         " NON-WRITE command.\n", cmd->init_task_tag);
1311                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1312         }
1313         se_cmd = &cmd->se_cmd;
1314         iscsit_mod_dataout_timer(cmd);
1315
1316         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1317                 pr_err("DataOut Offset: %u, Length %u greater than"
1318                         " iSCSI Command EDTL %u, protocol error.\n",
1319                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1320                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1321         }
1322
1323         if (cmd->unsolicited_data) {
1324                 int dump_unsolicited_data = 0;
1325
1326                 if (conn->sess->sess_ops->InitialR2T) {
1327                         pr_err("Received unexpected unsolicited data"
1328                                 " while InitialR2T=Yes, protocol error.\n");
1329                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1330                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1331                         return -1;
1332                 }
1333                 /*
1334                  * Special case for dealing with Unsolicited DataOUT
1335                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1336                  * failures;
1337                  */
1338
1339                 /* Something's amiss if we're not in WRITE_PENDING state... */
1340                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1341                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1342                         dump_unsolicited_data = 1;
1343
1344                 if (dump_unsolicited_data) {
1345                         /*
1346                          * Check if a delayed TASK_ABORTED status needs to
1347                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1348                          * received with the unsolicitied data out.
1349                          */
1350                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1351                                 iscsit_stop_dataout_timer(cmd);
1352
1353                         transport_check_aborted_status(se_cmd,
1354                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1355                         return iscsit_dump_data_payload(conn, payload_length, 1);
1356                 }
1357         } else {
1358                 /*
1359                  * For the normal solicited data path:
1360                  *
1361                  * Check for a delayed TASK_ABORTED status and dump any
1362                  * incoming data out payload if one exists.  Also, when the
1363                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1364                  * data out sequence, we decrement outstanding_r2ts.  Once
1365                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1366                  * TASK_ABORTED status.
1367                  */
1368                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1369                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1370                                 if (--cmd->outstanding_r2ts < 1) {
1371                                         iscsit_stop_dataout_timer(cmd);
1372                                         transport_check_aborted_status(
1373                                                         se_cmd, 1);
1374                                 }
1375
1376                         return iscsit_dump_data_payload(conn, payload_length, 1);
1377                 }
1378         }
1379         /*
1380          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1381          * within-command recovery checks before receiving the payload.
1382          */
1383         rc = iscsit_check_pre_dataout(cmd, buf);
1384         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1385                 return 0;
1386         else if (rc == DATAOUT_CANNOT_RECOVER)
1387                 return -1;
1388
1389         *out_cmd = cmd;
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1393
1394 static int
1395 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1396                    struct iscsi_data *hdr)
1397 {
1398         struct kvec *iov;
1399         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1400         u32 payload_length = ntoh24(hdr->dlength);
1401         int iov_ret, data_crc_failed = 0;
1402
1403         rx_size += payload_length;
1404         iov = &cmd->iov_data[0];
1405
1406         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1407                                    payload_length);
1408         if (iov_ret < 0)
1409                 return -1;
1410
1411         iov_count += iov_ret;
1412
1413         padding = ((-payload_length) & 3);
1414         if (padding != 0) {
1415                 iov[iov_count].iov_base = cmd->pad_bytes;
1416                 iov[iov_count++].iov_len = padding;
1417                 rx_size += padding;
1418                 pr_debug("Receiving %u padding bytes.\n", padding);
1419         }
1420
1421         if (conn->conn_ops->DataDigest) {
1422                 iov[iov_count].iov_base = &checksum;
1423                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1424                 rx_size += ISCSI_CRC_LEN;
1425         }
1426
1427         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1428
1429         iscsit_unmap_iovec(cmd);
1430
1431         if (rx_got != rx_size)
1432                 return -1;
1433
1434         if (conn->conn_ops->DataDigest) {
1435                 u32 data_crc;
1436
1437                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1438                                                     be32_to_cpu(hdr->offset),
1439                                                     payload_length, padding,
1440                                                     cmd->pad_bytes);
1441
1442                 if (checksum != data_crc) {
1443                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1444                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1445                                 " does not match computed 0x%08x\n",
1446                                 hdr->itt, hdr->offset, payload_length,
1447                                 hdr->datasn, checksum, data_crc);
1448                         data_crc_failed = 1;
1449                 } else {
1450                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1451                                 " %u bytes of Data Out\n", checksum,
1452                                 payload_length);
1453                 }
1454         }
1455
1456         return data_crc_failed;
1457 }
1458
1459 int
1460 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1461                              bool data_crc_failed)
1462 {
1463         struct iscsi_conn *conn = cmd->conn;
1464         int rc, ooo_cmdsn;
1465         /*
1466          * Increment post receive data and CRC values or perform
1467          * within-command recovery.
1468          */
1469         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1470         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1471                 return 0;
1472         else if (rc == DATAOUT_SEND_R2T) {
1473                 iscsit_set_dataout_sequence_values(cmd);
1474                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1475         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1476                 /*
1477                  * Handle extra special case for out of order
1478                  * Unsolicited Data Out.
1479                  */
1480                 spin_lock_bh(&cmd->istate_lock);
1481                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1482                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1483                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1484                 spin_unlock_bh(&cmd->istate_lock);
1485
1486                 iscsit_stop_dataout_timer(cmd);
1487                 if (ooo_cmdsn)
1488                         return 0;
1489                 target_execute_cmd(&cmd->se_cmd);
1490                 return 0;
1491         } else /* DATAOUT_CANNOT_RECOVER */
1492                 return -1;
1493
1494         return 0;
1495 }
1496 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1497
1498 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1499 {
1500         struct iscsi_cmd *cmd = NULL;
1501         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1502         int rc;
1503         bool data_crc_failed = false;
1504
1505         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1506         if (rc < 0)
1507                 return 0;
1508         else if (!cmd)
1509                 return 0;
1510
1511         rc = iscsit_get_dataout(conn, cmd, hdr);
1512         if (rc < 0)
1513                 return rc;
1514         else if (rc > 0)
1515                 data_crc_failed = true;
1516
1517         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1518 }
1519
1520 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1521                          struct iscsi_nopout *hdr)
1522 {
1523         u32 payload_length = ntoh24(hdr->dlength);
1524
1525         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1526                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1527                 if (!cmd)
1528                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1529                                                  (unsigned char *)hdr);
1530
1531                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1532                                          (unsigned char *)hdr);
1533         }
1534
1535         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1536                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1537                         " not set, protocol error.\n");
1538                 if (!cmd)
1539                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1540                                                  (unsigned char *)hdr);
1541
1542                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1543                                          (unsigned char *)hdr);
1544         }
1545
1546         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1547                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1548                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1549                         " error.\n", payload_length,
1550                         conn->conn_ops->MaxXmitDataSegmentLength);
1551                 if (!cmd)
1552                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1553                                                  (unsigned char *)hdr);
1554
1555                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1556                                          (unsigned char *)hdr);
1557         }
1558
1559         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1560                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1561                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1562                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1563                 payload_length);
1564         /*
1565          * This is not a response to a Unsolicited NopIN, which means
1566          * it can either be a NOPOUT ping request (with a valid ITT),
1567          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1568          * Either way, make sure we allocate an struct iscsi_cmd, as both
1569          * can contain ping data.
1570          */
1571         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1572                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1573                 cmd->i_state            = ISTATE_SEND_NOPIN;
1574                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1575                                                 1 : 0);
1576                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1577                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1578                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1579                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1580                 cmd->data_direction     = DMA_NONE;
1581         }
1582
1583         return 0;
1584 }
1585 EXPORT_SYMBOL(iscsit_setup_nop_out);
1586
1587 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1588                            struct iscsi_nopout *hdr)
1589 {
1590         struct iscsi_cmd *cmd_p = NULL;
1591         int cmdsn_ret = 0;
1592         /*
1593          * Initiator is expecting a NopIN ping reply..
1594          */
1595         if (hdr->itt != RESERVED_ITT) {
1596                 if (!cmd)
1597                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1598                                                 (unsigned char *)hdr);
1599
1600                 spin_lock_bh(&conn->cmd_lock);
1601                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1602                 spin_unlock_bh(&conn->cmd_lock);
1603
1604                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1605
1606                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1607                         iscsit_add_cmd_to_response_queue(cmd, conn,
1608                                                          cmd->i_state);
1609                         return 0;
1610                 }
1611
1612                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1613                                 (unsigned char *)hdr, hdr->cmdsn);
1614                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1615                         return 0;
1616                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1617                         return -1;
1618
1619                 return 0;
1620         }
1621         /*
1622          * This was a response to a unsolicited NOPIN ping.
1623          */
1624         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1625                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1626                 if (!cmd_p)
1627                         return -EINVAL;
1628
1629                 iscsit_stop_nopin_response_timer(conn);
1630
1631                 cmd_p->i_state = ISTATE_REMOVE;
1632                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1633
1634                 iscsit_start_nopin_timer(conn);
1635                 return 0;
1636         }
1637         /*
1638          * Otherwise, initiator is not expecting a NOPIN is response.
1639          * Just ignore for now.
1640          */
1641         return 0;
1642 }
1643 EXPORT_SYMBOL(iscsit_process_nop_out);
1644
1645 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1646                                  unsigned char *buf)
1647 {
1648         unsigned char *ping_data = NULL;
1649         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1650         struct kvec *iov = NULL;
1651         u32 payload_length = ntoh24(hdr->dlength);
1652         int ret;
1653
1654         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1655         if (ret < 0)
1656                 return 0;
1657         /*
1658          * Handle NOP-OUT payload for traditional iSCSI sockets
1659          */
1660         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1661                 u32 checksum, data_crc, padding = 0;
1662                 int niov = 0, rx_got, rx_size = payload_length;
1663
1664                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1665                 if (!ping_data) {
1666                         pr_err("Unable to allocate memory for"
1667                                 " NOPOUT ping data.\n");
1668                         ret = -1;
1669                         goto out;
1670                 }
1671
1672                 iov = &cmd->iov_misc[0];
1673                 iov[niov].iov_base      = ping_data;
1674                 iov[niov++].iov_len     = payload_length;
1675
1676                 padding = ((-payload_length) & 3);
1677                 if (padding != 0) {
1678                         pr_debug("Receiving %u additional bytes"
1679                                 " for padding.\n", padding);
1680                         iov[niov].iov_base      = &cmd->pad_bytes;
1681                         iov[niov++].iov_len     = padding;
1682                         rx_size += padding;
1683                 }
1684                 if (conn->conn_ops->DataDigest) {
1685                         iov[niov].iov_base      = &checksum;
1686                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1687                         rx_size += ISCSI_CRC_LEN;
1688                 }
1689
1690                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1691                 if (rx_got != rx_size) {
1692                         ret = -1;
1693                         goto out;
1694                 }
1695
1696                 if (conn->conn_ops->DataDigest) {
1697                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1698                                         ping_data, payload_length,
1699                                         padding, cmd->pad_bytes,
1700                                         (u8 *)&data_crc);
1701
1702                         if (checksum != data_crc) {
1703                                 pr_err("Ping data CRC32C DataDigest"
1704                                 " 0x%08x does not match computed 0x%08x\n",
1705                                         checksum, data_crc);
1706                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1707                                         pr_err("Unable to recover from"
1708                                         " NOPOUT Ping DataCRC failure while in"
1709                                                 " ERL=0.\n");
1710                                         ret = -1;
1711                                         goto out;
1712                                 } else {
1713                                         /*
1714                                          * Silently drop this PDU and let the
1715                                          * initiator plug the CmdSN gap.
1716                                          */
1717                                         pr_debug("Dropping NOPOUT"
1718                                         " Command CmdSN: 0x%08x due to"
1719                                         " DataCRC error.\n", hdr->cmdsn);
1720                                         ret = 0;
1721                                         goto out;
1722                                 }
1723                         } else {
1724                                 pr_debug("Got CRC32C DataDigest"
1725                                 " 0x%08x for %u bytes of ping data.\n",
1726                                         checksum, payload_length);
1727                         }
1728                 }
1729
1730                 ping_data[payload_length] = '\0';
1731                 /*
1732                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1733                  */
1734                 cmd->buf_ptr = ping_data;
1735                 cmd->buf_ptr_size = payload_length;
1736
1737                 pr_debug("Got %u bytes of NOPOUT ping"
1738                         " data.\n", payload_length);
1739                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1740         }
1741
1742         return iscsit_process_nop_out(conn, cmd, hdr);
1743 out:
1744         if (cmd)
1745                 iscsit_free_cmd(cmd, false);
1746
1747         kfree(ping_data);
1748         return ret;
1749 }
1750
1751 int
1752 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1753                            unsigned char *buf)
1754 {
1755         struct se_tmr_req *se_tmr;
1756         struct iscsi_tmr_req *tmr_req;
1757         struct iscsi_tm *hdr;
1758         int out_of_order_cmdsn = 0, ret;
1759         bool sess_ref = false;
1760         u8 function;
1761
1762         hdr                     = (struct iscsi_tm *) buf;
1763         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1764         function = hdr->flags;
1765
1766         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1767                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1768                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1769                 hdr->rtt, hdr->refcmdsn, conn->cid);
1770
1771         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1772             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1773              hdr->rtt != RESERVED_ITT)) {
1774                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1775                 hdr->rtt = RESERVED_ITT;
1776         }
1777
1778         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1779                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1780                 pr_err("Task Management Request TASK_REASSIGN not"
1781                         " issued as immediate command, bad iSCSI Initiator"
1782                                 "implementation\n");
1783                 return iscsit_add_reject_cmd(cmd,
1784                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1785         }
1786         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1787             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1788                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1789
1790         cmd->data_direction = DMA_NONE;
1791
1792         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1793         if (!cmd->tmr_req) {
1794                 pr_err("Unable to allocate memory for"
1795                         " Task Management command!\n");
1796                 return iscsit_add_reject_cmd(cmd,
1797                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1798                                              buf);
1799         }
1800
1801         /*
1802          * TASK_REASSIGN for ERL=2 / connection stays inside of
1803          * LIO-Target $FABRIC_MOD
1804          */
1805         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1806
1807                 u8 tcm_function;
1808                 int ret;
1809
1810                 transport_init_se_cmd(&cmd->se_cmd,
1811                                       &lio_target_fabric_configfs->tf_ops,
1812                                       conn->sess->se_sess, 0, DMA_NONE,
1813                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1814
1815                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1816                 sess_ref = true;
1817
1818                 switch (function) {
1819                 case ISCSI_TM_FUNC_ABORT_TASK:
1820                         tcm_function = TMR_ABORT_TASK;
1821                         break;
1822                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1823                         tcm_function = TMR_ABORT_TASK_SET;
1824                         break;
1825                 case ISCSI_TM_FUNC_CLEAR_ACA:
1826                         tcm_function = TMR_CLEAR_ACA;
1827                         break;
1828                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1829                         tcm_function = TMR_CLEAR_TASK_SET;
1830                         break;
1831                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1832                         tcm_function = TMR_LUN_RESET;
1833                         break;
1834                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1835                         tcm_function = TMR_TARGET_WARM_RESET;
1836                         break;
1837                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1838                         tcm_function = TMR_TARGET_COLD_RESET;
1839                         break;
1840                 default:
1841                         pr_err("Unknown iSCSI TMR Function:"
1842                                " 0x%02x\n", function);
1843                         return iscsit_add_reject_cmd(cmd,
1844                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1845                 }
1846
1847                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1848                                          tcm_function, GFP_KERNEL);
1849                 if (ret < 0)
1850                         return iscsit_add_reject_cmd(cmd,
1851                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1852
1853                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1854         }
1855
1856         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1857         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1858         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1859         cmd->init_task_tag      = hdr->itt;
1860         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1861         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1862         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1863         se_tmr                  = cmd->se_cmd.se_tmr_req;
1864         tmr_req                 = cmd->tmr_req;
1865         /*
1866          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1867          */
1868         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1869                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1870                                                scsilun_to_int(&hdr->lun));
1871                 if (ret < 0) {
1872                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1873                         goto attach;
1874                 }
1875         }
1876
1877         switch (function) {
1878         case ISCSI_TM_FUNC_ABORT_TASK:
1879                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1880                 if (se_tmr->response)
1881                         goto attach;
1882                 break;
1883         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1884         case ISCSI_TM_FUNC_CLEAR_ACA:
1885         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1886         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1887                 break;
1888         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1889                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1890                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1891                         goto attach;
1892                 }
1893                 break;
1894         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1895                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1896                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1897                         goto attach;
1898                 }
1899                 break;
1900         case ISCSI_TM_FUNC_TASK_REASSIGN:
1901                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1902                 /*
1903                  * Perform sanity checks on the ExpDataSN only if the
1904                  * TASK_REASSIGN was successful.
1905                  */
1906                 if (se_tmr->response)
1907                         break;
1908
1909                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1910                         return iscsit_add_reject_cmd(cmd,
1911                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1912                 break;
1913         default:
1914                 pr_err("Unknown TMR function: 0x%02x, protocol"
1915                         " error.\n", function);
1916                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1917                 goto attach;
1918         }
1919
1920         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1921             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1922                 se_tmr->call_transport = 1;
1923 attach:
1924         spin_lock_bh(&conn->cmd_lock);
1925         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1926         spin_unlock_bh(&conn->cmd_lock);
1927
1928         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1929                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1930                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1931                         out_of_order_cmdsn = 1;
1932                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1933                         return 0;
1934                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1935                         return -1;
1936         }
1937         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1938
1939         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1940                 return 0;
1941         /*
1942          * Found the referenced task, send to transport for processing.
1943          */
1944         if (se_tmr->call_transport)
1945                 return transport_generic_handle_tmr(&cmd->se_cmd);
1946
1947         /*
1948          * Could not find the referenced LUN, task, or Task Management
1949          * command not authorized or supported.  Change state and
1950          * let the tx_thread send the response.
1951          *
1952          * For connection recovery, this is also the default action for
1953          * TMR TASK_REASSIGN.
1954          */
1955         if (sess_ref) {
1956                 pr_debug("Handle TMR, using sess_ref=true check\n");
1957                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1958         }
1959
1960         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1961         return 0;
1962 }
1963 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1964
1965 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1966 int
1967 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1968                       struct iscsi_text *hdr)
1969 {
1970         u32 payload_length = ntoh24(hdr->dlength);
1971
1972         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1973                 pr_err("Unable to accept text parameter length: %u"
1974                         "greater than MaxXmitDataSegmentLength %u.\n",
1975                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1976                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1977                                          (unsigned char *)hdr);
1978         }
1979
1980         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1981              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1982                 pr_err("Multi sequence text commands currently not supported\n");
1983                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1984                                         (unsigned char *)hdr);
1985         }
1986
1987         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1988                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1989                 hdr->exp_statsn, payload_length);
1990
1991         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1992         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1993         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1994         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1995         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1996         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1997         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1998         cmd->data_direction     = DMA_NONE;
1999
2000         return 0;
2001 }
2002 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2003
2004 int
2005 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2006                         struct iscsi_text *hdr)
2007 {
2008         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2009         int cmdsn_ret;
2010
2011         if (!text_in) {
2012                 pr_err("Unable to locate text_in buffer for sendtargets"
2013                        " discovery\n");
2014                 goto reject;
2015         }
2016         if (strncmp("SendTargets", text_in, 11) != 0) {
2017                 pr_err("Received Text Data that is not"
2018                         " SendTargets, cannot continue.\n");
2019                 goto reject;
2020         }
2021         text_ptr = strchr(text_in, '=');
2022         if (!text_ptr) {
2023                 pr_err("No \"=\" separator found in Text Data,"
2024                         "  cannot continue.\n");
2025                 goto reject;
2026         }
2027         if (!strncmp("=All", text_ptr, 4)) {
2028                 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2029         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2030                    !strncmp("=eui.", text_ptr, 5)) {
2031                 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2032         } else {
2033                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2034                 goto reject;
2035         }
2036
2037         spin_lock_bh(&conn->cmd_lock);
2038         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2039         spin_unlock_bh(&conn->cmd_lock);
2040
2041         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2042
2043         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2044                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2045                                 (unsigned char *)hdr, hdr->cmdsn);
2046                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2047                         return -1;
2048
2049                 return 0;
2050         }
2051
2052         return iscsit_execute_cmd(cmd, 0);
2053
2054 reject:
2055         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2056                                  (unsigned char *)hdr);
2057 }
2058 EXPORT_SYMBOL(iscsit_process_text_cmd);
2059
2060 static int
2061 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2062                        unsigned char *buf)
2063 {
2064         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2065         char *text_in = NULL;
2066         u32 payload_length = ntoh24(hdr->dlength);
2067         int rx_size, rc;
2068
2069         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2070         if (rc < 0)
2071                 return 0;
2072
2073         rx_size = payload_length;
2074         if (payload_length) {
2075                 u32 checksum = 0, data_crc = 0;
2076                 u32 padding = 0, pad_bytes = 0;
2077                 int niov = 0, rx_got;
2078                 struct kvec iov[3];
2079
2080                 text_in = kzalloc(payload_length, GFP_KERNEL);
2081                 if (!text_in) {
2082                         pr_err("Unable to allocate memory for"
2083                                 " incoming text parameters\n");
2084                         goto reject;
2085                 }
2086                 cmd->text_in_ptr = text_in;
2087
2088                 memset(iov, 0, 3 * sizeof(struct kvec));
2089                 iov[niov].iov_base      = text_in;
2090                 iov[niov++].iov_len     = payload_length;
2091
2092                 padding = ((-payload_length) & 3);
2093                 if (padding != 0) {
2094                         iov[niov].iov_base = &pad_bytes;
2095                         iov[niov++].iov_len  = padding;
2096                         rx_size += padding;
2097                         pr_debug("Receiving %u additional bytes"
2098                                         " for padding.\n", padding);
2099                 }
2100                 if (conn->conn_ops->DataDigest) {
2101                         iov[niov].iov_base      = &checksum;
2102                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2103                         rx_size += ISCSI_CRC_LEN;
2104                 }
2105
2106                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2107                 if (rx_got != rx_size)
2108                         goto reject;
2109
2110                 if (conn->conn_ops->DataDigest) {
2111                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2112                                         text_in, payload_length,
2113                                         padding, (u8 *)&pad_bytes,
2114                                         (u8 *)&data_crc);
2115
2116                         if (checksum != data_crc) {
2117                                 pr_err("Text data CRC32C DataDigest"
2118                                         " 0x%08x does not match computed"
2119                                         " 0x%08x\n", checksum, data_crc);
2120                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2121                                         pr_err("Unable to recover from"
2122                                         " Text Data digest failure while in"
2123                                                 " ERL=0.\n");
2124                                         goto reject;
2125                                 } else {
2126                                         /*
2127                                          * Silently drop this PDU and let the
2128                                          * initiator plug the CmdSN gap.
2129                                          */
2130                                         pr_debug("Dropping Text"
2131                                         " Command CmdSN: 0x%08x due to"
2132                                         " DataCRC error.\n", hdr->cmdsn);
2133                                         kfree(text_in);
2134                                         return 0;
2135                                 }
2136                         } else {
2137                                 pr_debug("Got CRC32C DataDigest"
2138                                         " 0x%08x for %u bytes of text data.\n",
2139                                                 checksum, payload_length);
2140                         }
2141                 }
2142                 text_in[payload_length - 1] = '\0';
2143                 pr_debug("Successfully read %d bytes of text"
2144                                 " data.\n", payload_length);
2145         }
2146
2147         return iscsit_process_text_cmd(conn, cmd, hdr);
2148
2149 reject:
2150         kfree(cmd->text_in_ptr);
2151         cmd->text_in_ptr = NULL;
2152         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2153 }
2154 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2155
2156 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2157 {
2158         struct iscsi_conn *conn_p;
2159         struct iscsi_session *sess = conn->sess;
2160
2161         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2162                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2163
2164         atomic_set(&sess->session_logout, 1);
2165         atomic_set(&conn->conn_logout_remove, 1);
2166         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2167
2168         iscsit_inc_conn_usage_count(conn);
2169         iscsit_inc_session_usage_count(sess);
2170
2171         spin_lock_bh(&sess->conn_lock);
2172         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2173                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2174                         continue;
2175
2176                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2177                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2178         }
2179         spin_unlock_bh(&sess->conn_lock);
2180
2181         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2182
2183         return 0;
2184 }
2185
2186 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2187 {
2188         struct iscsi_conn *l_conn;
2189         struct iscsi_session *sess = conn->sess;
2190
2191         pr_debug("Received logout request CLOSECONNECTION for CID:"
2192                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2193
2194         /*
2195          * A Logout Request with a CLOSECONNECTION reason code for a CID
2196          * can arrive on a connection with a differing CID.
2197          */
2198         if (conn->cid == cmd->logout_cid) {
2199                 spin_lock_bh(&conn->state_lock);
2200                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2201                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2202
2203                 atomic_set(&conn->conn_logout_remove, 1);
2204                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2205                 iscsit_inc_conn_usage_count(conn);
2206
2207                 spin_unlock_bh(&conn->state_lock);
2208         } else {
2209                 /*
2210                  * Handle all different cid CLOSECONNECTION requests in
2211                  * iscsit_logout_post_handler_diffcid() as to give enough
2212                  * time for any non immediate command's CmdSN to be
2213                  * acknowledged on the connection in question.
2214                  *
2215                  * Here we simply make sure the CID is still around.
2216                  */
2217                 l_conn = iscsit_get_conn_from_cid(sess,
2218                                 cmd->logout_cid);
2219                 if (!l_conn) {
2220                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2221                         iscsit_add_cmd_to_response_queue(cmd, conn,
2222                                         cmd->i_state);
2223                         return 0;
2224                 }
2225
2226                 iscsit_dec_conn_usage_count(l_conn);
2227         }
2228
2229         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2230
2231         return 0;
2232 }
2233
2234 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2235 {
2236         struct iscsi_session *sess = conn->sess;
2237
2238         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2239                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2240
2241         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2242                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2243                         " while ERL!=2.\n");
2244                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2245                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2246                 return 0;
2247         }
2248
2249         if (conn->cid == cmd->logout_cid) {
2250                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2251                         " with CID: %hu on CID: %hu, implementation error.\n",
2252                                 cmd->logout_cid, conn->cid);
2253                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2254                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2255                 return 0;
2256         }
2257
2258         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2259
2260         return 0;
2261 }
2262
2263 int
2264 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2265                         unsigned char *buf)
2266 {
2267         int cmdsn_ret, logout_remove = 0;
2268         u8 reason_code = 0;
2269         struct iscsi_logout *hdr;
2270         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2271
2272         hdr                     = (struct iscsi_logout *) buf;
2273         reason_code             = (hdr->flags & 0x7f);
2274
2275         if (tiqn) {
2276                 spin_lock(&tiqn->logout_stats.lock);
2277                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2278                         tiqn->logout_stats.normal_logouts++;
2279                 else
2280                         tiqn->logout_stats.abnormal_logouts++;
2281                 spin_unlock(&tiqn->logout_stats.lock);
2282         }
2283
2284         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2285                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2286                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2287                 hdr->cid, conn->cid);
2288
2289         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2290                 pr_err("Received logout request on connection that"
2291                         " is not in logged in state, ignoring request.\n");
2292                 iscsit_free_cmd(cmd, false);
2293                 return 0;
2294         }
2295
2296         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2297         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2298         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2299         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2300         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2301         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2302         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2303         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2304         cmd->logout_reason      = reason_code;
2305         cmd->data_direction     = DMA_NONE;
2306
2307         /*
2308          * We need to sleep in these cases (by returning 1) until the Logout
2309          * Response gets sent in the tx thread.
2310          */
2311         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2312            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2313             be16_to_cpu(hdr->cid) == conn->cid))
2314                 logout_remove = 1;
2315
2316         spin_lock_bh(&conn->cmd_lock);
2317         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2318         spin_unlock_bh(&conn->cmd_lock);
2319
2320         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2321                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2322
2323         /*
2324          * Immediate commands are executed, well, immediately.
2325          * Non-Immediate Logout Commands are executed in CmdSN order.
2326          */
2327         if (cmd->immediate_cmd) {
2328                 int ret = iscsit_execute_cmd(cmd, 0);
2329
2330                 if (ret < 0)
2331                         return ret;
2332         } else {
2333                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2334                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2335                         logout_remove = 0;
2336                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2337                         return -1;
2338         }
2339
2340         return logout_remove;
2341 }
2342 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2343
2344 static int iscsit_handle_snack(
2345         struct iscsi_conn *conn,
2346         unsigned char *buf)
2347 {
2348         struct iscsi_snack *hdr;
2349
2350         hdr                     = (struct iscsi_snack *) buf;
2351         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2352
2353         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2354                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2355                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2356                         hdr->begrun, hdr->runlength, conn->cid);
2357
2358         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2359                 pr_err("Initiator sent SNACK request while in"
2360                         " ErrorRecoveryLevel=0.\n");
2361                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2362                                          buf);
2363         }
2364         /*
2365          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2366          * call from inside iscsi_send_recovery_datain_or_r2t().
2367          */
2368         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2369         case 0:
2370                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2371                         hdr->itt,
2372                         be32_to_cpu(hdr->ttt),
2373                         be32_to_cpu(hdr->begrun),
2374                         be32_to_cpu(hdr->runlength));
2375         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2376                 return iscsit_handle_status_snack(conn, hdr->itt,
2377                         be32_to_cpu(hdr->ttt),
2378                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2379         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2380                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2381                         be32_to_cpu(hdr->begrun),
2382                         be32_to_cpu(hdr->runlength));
2383         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2384                 /* FIXME: Support R-Data SNACK */
2385                 pr_err("R-Data SNACK Not Supported.\n");
2386                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2387                                          buf);
2388         default:
2389                 pr_err("Unknown SNACK type 0x%02x, protocol"
2390                         " error.\n", hdr->flags & 0x0f);
2391                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2392                                          buf);
2393         }
2394
2395         return 0;
2396 }
2397
2398 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2399 {
2400         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2401             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2402                 wait_for_completion_interruptible_timeout(
2403                                         &conn->rx_half_close_comp,
2404                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2405         }
2406 }
2407
2408 static int iscsit_handle_immediate_data(
2409         struct iscsi_cmd *cmd,
2410         struct iscsi_scsi_req *hdr,
2411         u32 length)
2412 {
2413         int iov_ret, rx_got = 0, rx_size = 0;
2414         u32 checksum, iov_count = 0, padding = 0;
2415         struct iscsi_conn *conn = cmd->conn;
2416         struct kvec *iov;
2417
2418         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2419         if (iov_ret < 0)
2420                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2421
2422         rx_size = length;
2423         iov_count = iov_ret;
2424         iov = &cmd->iov_data[0];
2425
2426         padding = ((-length) & 3);
2427         if (padding != 0) {
2428                 iov[iov_count].iov_base = cmd->pad_bytes;
2429                 iov[iov_count++].iov_len = padding;
2430                 rx_size += padding;
2431         }
2432
2433         if (conn->conn_ops->DataDigest) {
2434                 iov[iov_count].iov_base         = &checksum;
2435                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2436                 rx_size += ISCSI_CRC_LEN;
2437         }
2438
2439         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2440
2441         iscsit_unmap_iovec(cmd);
2442
2443         if (rx_got != rx_size) {
2444                 iscsit_rx_thread_wait_for_tcp(conn);
2445                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2446         }
2447
2448         if (conn->conn_ops->DataDigest) {
2449                 u32 data_crc;
2450
2451                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2452                                                     cmd->write_data_done, length, padding,
2453                                                     cmd->pad_bytes);
2454
2455                 if (checksum != data_crc) {
2456                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2457                                 " does not match computed 0x%08x\n", checksum,
2458                                 data_crc);
2459
2460                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2461                                 pr_err("Unable to recover from"
2462                                         " Immediate Data digest failure while"
2463                                         " in ERL=0.\n");
2464                                 iscsit_reject_cmd(cmd,
2465                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2466                                                 (unsigned char *)hdr);
2467                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2468                         } else {
2469                                 iscsit_reject_cmd(cmd,
2470                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2471                                                 (unsigned char *)hdr);
2472                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2473                         }
2474                 } else {
2475                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2476                                 " %u bytes of Immediate Data\n", checksum,
2477                                 length);
2478                 }
2479         }
2480
2481         cmd->write_data_done += length;
2482
2483         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2484                 spin_lock_bh(&cmd->istate_lock);
2485                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2486                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2487                 spin_unlock_bh(&cmd->istate_lock);
2488         }
2489
2490         return IMMEDIATE_DATA_NORMAL_OPERATION;
2491 }
2492
2493 /*
2494  *      Called with sess->conn_lock held.
2495  */
2496 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2497         with active network interface */
2498 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2499 {
2500         struct iscsi_cmd *cmd;
2501         struct iscsi_conn *conn_p;
2502         bool found = false;
2503
2504         /*
2505          * Only send a Asynchronous Message on connections whos network
2506          * interface is still functional.
2507          */
2508         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2509                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2510                         iscsit_inc_conn_usage_count(conn_p);
2511                         found = true;
2512                         break;
2513                 }
2514         }
2515
2516         if (!found)
2517                 return;
2518
2519         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2520         if (!cmd) {
2521                 iscsit_dec_conn_usage_count(conn_p);
2522                 return;
2523         }
2524
2525         cmd->logout_cid = conn->cid;
2526         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2527         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2528
2529         spin_lock_bh(&conn_p->cmd_lock);
2530         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2531         spin_unlock_bh(&conn_p->cmd_lock);
2532
2533         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2534         iscsit_dec_conn_usage_count(conn_p);
2535 }
2536
2537 static int iscsit_send_conn_drop_async_message(
2538         struct iscsi_cmd *cmd,
2539         struct iscsi_conn *conn)
2540 {
2541         struct iscsi_async *hdr;
2542
2543         cmd->tx_size = ISCSI_HDR_LEN;
2544         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2545
2546         hdr                     = (struct iscsi_async *) cmd->pdu;
2547         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2548         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2549         cmd->init_task_tag      = RESERVED_ITT;
2550         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2551         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2552         cmd->stat_sn            = conn->stat_sn++;
2553         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2554         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2555         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2556         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2557         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2558         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2559         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2560
2561         if (conn->conn_ops->HeaderDigest) {
2562                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2563
2564                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2565                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2566
2567                 cmd->tx_size += ISCSI_CRC_LEN;
2568                 pr_debug("Attaching CRC32C HeaderDigest to"
2569                         " Async Message 0x%08x\n", *header_digest);
2570         }
2571
2572         cmd->iov_misc[0].iov_base       = cmd->pdu;
2573         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2574         cmd->iov_misc_count             = 1;
2575
2576         pr_debug("Sending Connection Dropped Async Message StatSN:"
2577                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2578                         cmd->logout_cid, conn->cid);
2579         return 0;
2580 }
2581
2582 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2583 {
2584         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2585             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2586                 wait_for_completion_interruptible_timeout(
2587                                         &conn->tx_half_close_comp,
2588                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2589         }
2590 }
2591
2592 static void
2593 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2594                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2595                         bool set_statsn)
2596 {
2597         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2598         hdr->flags              = datain->flags;
2599         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2600                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2601                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2602                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2603                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2604                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2605                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2606                 }
2607         }
2608         hton24(hdr->dlength, datain->length);
2609         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2610                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2611                                 (struct scsi_lun *)&hdr->lun);
2612         else
2613                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2614
2615         hdr->itt                = cmd->init_task_tag;
2616
2617         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2618                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2619         else
2620                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2621         if (set_statsn)
2622                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2623         else
2624                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2625
2626         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2627         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2628         hdr->datasn             = cpu_to_be32(datain->data_sn);
2629         hdr->offset             = cpu_to_be32(datain->offset);
2630
2631         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2632                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2633                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2634                 ntohl(hdr->offset), datain->length, conn->cid);
2635 }
2636
2637 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2638 {
2639         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2640         struct iscsi_datain datain;
2641         struct iscsi_datain_req *dr;
2642         struct kvec *iov;
2643         u32 iov_count = 0, tx_size = 0;
2644         int eodr = 0, ret, iov_ret;
2645         bool set_statsn = false;
2646
2647         memset(&datain, 0, sizeof(struct iscsi_datain));
2648         dr = iscsit_get_datain_values(cmd, &datain);
2649         if (!dr) {
2650                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2651                                 cmd->init_task_tag);
2652                 return -1;
2653         }
2654         /*
2655          * Be paranoid and double check the logic for now.
2656          */
2657         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2658                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2659                         " datain.length: %u exceeds cmd->data_length: %u\n",
2660                         cmd->init_task_tag, datain.offset, datain.length,
2661                         cmd->se_cmd.data_length);
2662                 return -1;
2663         }
2664
2665         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2666         /*
2667          * Special case for successfully execution w/ both DATAIN
2668          * and Sense Data.
2669          */
2670         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2671             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2672                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2673         else {
2674                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2675                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2676                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2677                         cmd->stat_sn = conn->stat_sn++;
2678                         set_statsn = true;
2679                 } else if (dr->dr_complete ==
2680                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2681                         set_statsn = true;
2682         }
2683
2684         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2685
2686         iov = &cmd->iov_data[0];
2687         iov[iov_count].iov_base = cmd->pdu;
2688         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2689         tx_size += ISCSI_HDR_LEN;
2690
2691         if (conn->conn_ops->HeaderDigest) {
2692                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2693
2694                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2695                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2696
2697                 iov[0].iov_len += ISCSI_CRC_LEN;
2698                 tx_size += ISCSI_CRC_LEN;
2699
2700                 pr_debug("Attaching CRC32 HeaderDigest"
2701                         " for DataIN PDU 0x%08x\n", *header_digest);
2702         }
2703
2704         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2705                                 datain.offset, datain.length);
2706         if (iov_ret < 0)
2707                 return -1;
2708
2709         iov_count += iov_ret;
2710         tx_size += datain.length;
2711
2712         cmd->padding = ((-datain.length) & 3);
2713         if (cmd->padding) {
2714                 iov[iov_count].iov_base         = cmd->pad_bytes;
2715                 iov[iov_count++].iov_len        = cmd->padding;
2716                 tx_size += cmd->padding;
2717
2718                 pr_debug("Attaching %u padding bytes\n",
2719                                 cmd->padding);
2720         }
2721         if (conn->conn_ops->DataDigest) {
2722                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2723                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2724
2725                 iov[iov_count].iov_base = &cmd->data_crc;
2726                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2727                 tx_size += ISCSI_CRC_LEN;
2728
2729                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2730                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2731         }
2732
2733         cmd->iov_data_count = iov_count;
2734         cmd->tx_size = tx_size;
2735
2736         /* sendpage is preferred but can't insert markers */
2737         if (!conn->conn_ops->IFMarker)
2738                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2739         else
2740                 ret = iscsit_send_tx_data(cmd, conn, 0);
2741
2742         iscsit_unmap_iovec(cmd);
2743
2744         if (ret < 0) {
2745                 iscsit_tx_thread_wait_for_tcp(conn);
2746                 return ret;
2747         }
2748
2749         if (dr->dr_complete) {
2750                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2751                                 2 : 1;
2752                 iscsit_free_datain_req(cmd, dr);
2753         }
2754
2755         return eodr;
2756 }
2757
2758 int
2759 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2760                         struct iscsi_logout_rsp *hdr)
2761 {
2762         struct iscsi_conn *logout_conn = NULL;
2763         struct iscsi_conn_recovery *cr = NULL;
2764         struct iscsi_session *sess = conn->sess;
2765         /*
2766          * The actual shutting down of Sessions and/or Connections
2767          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2768          * is done in scsi_logout_post_handler().
2769          */
2770         switch (cmd->logout_reason) {
2771         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2772                 pr_debug("iSCSI session logout successful, setting"
2773                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2774                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2775                 break;
2776         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2777                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2778                         break;
2779                 /*
2780                  * For CLOSECONNECTION logout requests carrying
2781                  * a matching logout CID -> local CID, the reference
2782                  * for the local CID will have been incremented in
2783                  * iscsi_logout_closeconnection().
2784                  *
2785                  * For CLOSECONNECTION logout requests carrying
2786                  * a different CID than the connection it arrived
2787                  * on, the connection responding to cmd->logout_cid
2788                  * is stopped in iscsit_logout_post_handler_diffcid().
2789                  */
2790
2791                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2792                         " successful.\n", cmd->logout_cid, conn->cid);
2793                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2794                 break;
2795         case ISCSI_LOGOUT_REASON_RECOVERY:
2796                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2797                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2798                         break;
2799                 /*
2800                  * If the connection is still active from our point of view
2801                  * force connection recovery to occur.
2802                  */
2803                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2804                                 cmd->logout_cid);
2805                 if (logout_conn) {
2806                         iscsit_connection_reinstatement_rcfr(logout_conn);
2807                         iscsit_dec_conn_usage_count(logout_conn);
2808                 }
2809
2810                 cr = iscsit_get_inactive_connection_recovery_entry(
2811                                 conn->sess, cmd->logout_cid);
2812                 if (!cr) {
2813                         pr_err("Unable to locate CID: %hu for"
2814                         " REMOVECONNFORRECOVERY Logout Request.\n",
2815                                 cmd->logout_cid);
2816                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2817                         break;
2818                 }
2819
2820                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2821
2822                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2823                         " for recovery for CID: %hu on CID: %hu successful.\n",
2824                                 cmd->logout_cid, conn->cid);
2825                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2826                 break;
2827         default:
2828                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2829                                 cmd->logout_reason);
2830                 return -1;
2831         }
2832
2833         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2834         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2835         hdr->response           = cmd->logout_response;
2836         hdr->itt                = cmd->init_task_tag;
2837         cmd->stat_sn            = conn->stat_sn++;
2838         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2839
2840         iscsit_increment_maxcmdsn(cmd, conn->sess);
2841         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2842         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2843
2844         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2845                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2846                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2847                 cmd->logout_cid, conn->cid);
2848
2849         return 0;
2850 }
2851 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2852
2853 static int
2854 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2855 {
2856         struct kvec *iov;
2857         int niov = 0, tx_size, rc;
2858
2859         rc = iscsit_build_logout_rsp(cmd, conn,
2860                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2861         if (rc < 0)
2862                 return rc;
2863
2864         tx_size = ISCSI_HDR_LEN;
2865         iov = &cmd->iov_misc[0];
2866         iov[niov].iov_base      = cmd->pdu;
2867         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2868
2869         if (conn->conn_ops->HeaderDigest) {
2870                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2871
2872                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2873                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2874
2875                 iov[0].iov_len += ISCSI_CRC_LEN;
2876                 tx_size += ISCSI_CRC_LEN;
2877                 pr_debug("Attaching CRC32C HeaderDigest to"
2878                         " Logout Response 0x%08x\n", *header_digest);
2879         }
2880         cmd->iov_misc_count = niov;
2881         cmd->tx_size = tx_size;
2882
2883         return 0;
2884 }
2885
2886 void
2887 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2888                        struct iscsi_nopin *hdr, bool nopout_response)
2889 {
2890         hdr->opcode             = ISCSI_OP_NOOP_IN;
2891         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2892         hton24(hdr->dlength, cmd->buf_ptr_size);
2893         if (nopout_response)
2894                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2895         hdr->itt                = cmd->init_task_tag;
2896         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2897         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2898                                   conn->stat_sn;
2899         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2900
2901         if (nopout_response)
2902                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2903
2904         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2905         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2906
2907         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2908                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2909                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2910                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2911 }
2912 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2913
2914 /*
2915  *      Unsolicited NOPIN, either requesting a response or not.
2916  */
2917 static int iscsit_send_unsolicited_nopin(
2918         struct iscsi_cmd *cmd,
2919         struct iscsi_conn *conn,
2920         int want_response)
2921 {
2922         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2923         int tx_size = ISCSI_HDR_LEN, ret;
2924
2925         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2926
2927         if (conn->conn_ops->HeaderDigest) {
2928                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2929
2930                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2931                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2932
2933                 tx_size += ISCSI_CRC_LEN;
2934                 pr_debug("Attaching CRC32C HeaderDigest to"
2935                         " NopIN 0x%08x\n", *header_digest);
2936         }
2937
2938         cmd->iov_misc[0].iov_base       = cmd->pdu;
2939         cmd->iov_misc[0].iov_len        = tx_size;
2940         cmd->iov_misc_count     = 1;
2941         cmd->tx_size            = tx_size;
2942
2943         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2944                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2945
2946         ret = iscsit_send_tx_data(cmd, conn, 1);
2947         if (ret < 0) {
2948                 iscsit_tx_thread_wait_for_tcp(conn);
2949                 return ret;
2950         }
2951
2952         spin_lock_bh(&cmd->istate_lock);
2953         cmd->i_state = want_response ?
2954                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2955         spin_unlock_bh(&cmd->istate_lock);
2956
2957         return 0;
2958 }
2959
2960 static int
2961 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2962 {
2963         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2964         struct kvec *iov;
2965         u32 padding = 0;
2966         int niov = 0, tx_size;
2967
2968         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2969
2970         tx_size = ISCSI_HDR_LEN;
2971         iov = &cmd->iov_misc[0];
2972         iov[niov].iov_base      = cmd->pdu;
2973         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2974
2975         if (conn->conn_ops->HeaderDigest) {
2976                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2977
2978                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2979                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2980
2981                 iov[0].iov_len += ISCSI_CRC_LEN;
2982                 tx_size += ISCSI_CRC_LEN;
2983                 pr_debug("Attaching CRC32C HeaderDigest"
2984                         " to NopIn 0x%08x\n", *header_digest);
2985         }
2986
2987         /*
2988          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2989          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2990          */
2991         if (cmd->buf_ptr_size) {
2992                 iov[niov].iov_base      = cmd->buf_ptr;
2993                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2994                 tx_size += cmd->buf_ptr_size;
2995
2996                 pr_debug("Echoing back %u bytes of ping"
2997                         " data.\n", cmd->buf_ptr_size);
2998
2999                 padding = ((-cmd->buf_ptr_size) & 3);
3000                 if (padding != 0) {
3001                         iov[niov].iov_base = &cmd->pad_bytes;
3002                         iov[niov++].iov_len = padding;
3003                         tx_size += padding;
3004                         pr_debug("Attaching %u additional"
3005                                 " padding bytes.\n", padding);
3006                 }
3007                 if (conn->conn_ops->DataDigest) {
3008                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3009                                 cmd->buf_ptr, cmd->buf_ptr_size,
3010                                 padding, (u8 *)&cmd->pad_bytes,
3011                                 (u8 *)&cmd->data_crc);
3012
3013                         iov[niov].iov_base = &cmd->data_crc;
3014                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3015                         tx_size += ISCSI_CRC_LEN;
3016                         pr_debug("Attached DataDigest for %u"
3017                                 " bytes of ping data, CRC 0x%08x\n",
3018                                 cmd->buf_ptr_size, cmd->data_crc);
3019                 }
3020         }
3021
3022         cmd->iov_misc_count = niov;
3023         cmd->tx_size = tx_size;
3024
3025         return 0;
3026 }
3027
3028 static int iscsit_send_r2t(
3029         struct iscsi_cmd *cmd,
3030         struct iscsi_conn *conn)
3031 {
3032         int tx_size = 0;
3033         struct iscsi_r2t *r2t;
3034         struct iscsi_r2t_rsp *hdr;
3035         int ret;
3036
3037         r2t = iscsit_get_r2t_from_list(cmd);
3038         if (!r2t)
3039                 return -1;
3040
3041         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3042         memset(hdr, 0, ISCSI_HDR_LEN);
3043         hdr->opcode             = ISCSI_OP_R2T;
3044         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3045         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3046                         (struct scsi_lun *)&hdr->lun);
3047         hdr->itt                = cmd->init_task_tag;
3048         spin_lock_bh(&conn->sess->ttt_lock);
3049         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3050         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3051                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3052         spin_unlock_bh(&conn->sess->ttt_lock);
3053         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3054         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3055         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3056         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3057         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3058         hdr->data_offset        = cpu_to_be32(r2t->offset);
3059         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3060
3061         cmd->iov_misc[0].iov_base       = cmd->pdu;
3062         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3063         tx_size += ISCSI_HDR_LEN;
3064
3065         if (conn->conn_ops->HeaderDigest) {
3066                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3067
3068                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3069                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3070
3071                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3072                 tx_size += ISCSI_CRC_LEN;
3073                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3074                         " PDU 0x%08x\n", *header_digest);
3075         }
3076
3077         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3078                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3079                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3080                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3081                         r2t->offset, r2t->xfer_len, conn->cid);
3082
3083         cmd->iov_misc_count = 1;
3084         cmd->tx_size = tx_size;
3085
3086         spin_lock_bh(&cmd->r2t_lock);
3087         r2t->sent_r2t = 1;
3088         spin_unlock_bh(&cmd->r2t_lock);
3089
3090         ret = iscsit_send_tx_data(cmd, conn, 1);
3091         if (ret < 0) {
3092                 iscsit_tx_thread_wait_for_tcp(conn);
3093                 return ret;
3094         }
3095
3096         spin_lock_bh(&cmd->dataout_timeout_lock);
3097         iscsit_start_dataout_timer(cmd, conn);
3098         spin_unlock_bh(&cmd->dataout_timeout_lock);
3099
3100         return 0;
3101 }
3102
3103 /*
3104  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3105  *              connection recovery.
3106  */
3107 int iscsit_build_r2ts_for_cmd(
3108         struct iscsi_conn *conn,
3109         struct iscsi_cmd *cmd,
3110         bool recovery)
3111 {
3112         int first_r2t = 1;
3113         u32 offset = 0, xfer_len = 0;
3114
3115         spin_lock_bh(&cmd->r2t_lock);
3116         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3117                 spin_unlock_bh(&cmd->r2t_lock);
3118                 return 0;
3119         }
3120
3121         if (conn->sess->sess_ops->DataSequenceInOrder &&
3122             !recovery)
3123                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3124
3125         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3126                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3127                         offset = cmd->r2t_offset;
3128
3129                         if (first_r2t && recovery) {
3130                                 int new_data_end = offset +
3131                                         conn->sess->sess_ops->MaxBurstLength -
3132                                         cmd->next_burst_len;
3133
3134                                 if (new_data_end > cmd->se_cmd.data_length)
3135                                         xfer_len = cmd->se_cmd.data_length - offset;
3136                                 else
3137                                         xfer_len =
3138                                                 conn->sess->sess_ops->MaxBurstLength -
3139                                                 cmd->next_burst_len;
3140                         } else {
3141                                 int new_data_end = offset +
3142                                         conn->sess->sess_ops->MaxBurstLength;
3143
3144                                 if (new_data_end > cmd->se_cmd.data_length)
3145                                         xfer_len = cmd->se_cmd.data_length - offset;
3146                                 else
3147                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3148                         }
3149                         cmd->r2t_offset += xfer_len;
3150
3151                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3152                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3153                 } else {
3154                         struct iscsi_seq *seq;
3155
3156                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3157                         if (!seq) {
3158                                 spin_unlock_bh(&cmd->r2t_lock);
3159                                 return -1;
3160                         }
3161
3162                         offset = seq->offset;
3163                         xfer_len = seq->xfer_len;
3164
3165                         if (cmd->seq_send_order == cmd->seq_count)
3166                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3167                 }
3168                 cmd->outstanding_r2ts++;
3169                 first_r2t = 0;
3170
3171                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3172                         spin_unlock_bh(&cmd->r2t_lock);
3173                         return -1;
3174                 }
3175
3176                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3177                         break;
3178         }
3179         spin_unlock_bh(&cmd->r2t_lock);
3180
3181         return 0;
3182 }
3183
3184 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3185                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3186 {
3187         if (inc_stat_sn)
3188                 cmd->stat_sn = conn->stat_sn++;
3189
3190         atomic_long_inc(&conn->sess->rsp_pdus);
3191
3192         memset(hdr, 0, ISCSI_HDR_LEN);
3193         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3194         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3195         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3196                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3197                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3198         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3199                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3200                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3201         }
3202         hdr->response           = cmd->iscsi_response;
3203         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3204         hdr->itt                = cmd->init_task_tag;
3205         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3206
3207         iscsit_increment_maxcmdsn(cmd, conn->sess);
3208         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3209         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3210
3211         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3212                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3213                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3214                 cmd->se_cmd.scsi_status, conn->cid);
3215 }
3216 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3217
3218 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3219 {
3220         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3221         struct kvec *iov;
3222         u32 padding = 0, tx_size = 0;
3223         int iov_count = 0;
3224         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3225
3226         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3227
3228         iov = &cmd->iov_misc[0];
3229         iov[iov_count].iov_base = cmd->pdu;
3230         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3231         tx_size += ISCSI_HDR_LEN;
3232
3233         /*
3234          * Attach SENSE DATA payload to iSCSI Response PDU
3235          */
3236         if (cmd->se_cmd.sense_buffer &&
3237            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3238             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3239                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3240                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3241
3242                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3243                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3244                 iov[iov_count].iov_base = cmd->sense_buffer;
3245                 iov[iov_count++].iov_len =
3246                                 (cmd->se_cmd.scsi_sense_length + padding);
3247                 tx_size += cmd->se_cmd.scsi_sense_length;
3248
3249                 if (padding) {
3250                         memset(cmd->sense_buffer +
3251                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3252                         tx_size += padding;
3253                         pr_debug("Adding %u bytes of padding to"
3254                                 " SENSE.\n", padding);
3255                 }
3256
3257                 if (conn->conn_ops->DataDigest) {
3258                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3259                                 cmd->sense_buffer,
3260                                 (cmd->se_cmd.scsi_sense_length + padding),
3261                                 0, NULL, (u8 *)&cmd->data_crc);
3262
3263                         iov[iov_count].iov_base    = &cmd->data_crc;
3264                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3265                         tx_size += ISCSI_CRC_LEN;
3266
3267                         pr_debug("Attaching CRC32 DataDigest for"
3268                                 " SENSE, %u bytes CRC 0x%08x\n",
3269                                 (cmd->se_cmd.scsi_sense_length + padding),
3270                                 cmd->data_crc);
3271                 }
3272
3273                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3274                                 " Response PDU\n",
3275                                 cmd->se_cmd.scsi_sense_length);
3276         }
3277
3278         if (conn->conn_ops->HeaderDigest) {
3279                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3280
3281                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3282                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3283
3284                 iov[0].iov_len += ISCSI_CRC_LEN;
3285                 tx_size += ISCSI_CRC_LEN;
3286                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3287                                 " PDU 0x%08x\n", *header_digest);
3288         }
3289
3290         cmd->iov_misc_count = iov_count;
3291         cmd->tx_size = tx_size;
3292
3293         return 0;
3294 }
3295
3296 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3297 {
3298         switch (se_tmr->response) {
3299         case TMR_FUNCTION_COMPLETE:
3300                 return ISCSI_TMF_RSP_COMPLETE;
3301         case TMR_TASK_DOES_NOT_EXIST:
3302                 return ISCSI_TMF_RSP_NO_TASK;
3303         case TMR_LUN_DOES_NOT_EXIST:
3304                 return ISCSI_TMF_RSP_NO_LUN;
3305         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3306                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3307         case TMR_FUNCTION_REJECTED:
3308         default:
3309                 return ISCSI_TMF_RSP_REJECTED;
3310         }
3311 }
3312
3313 void
3314 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3315                           struct iscsi_tm_rsp *hdr)
3316 {
3317         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3318
3319         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3320         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3321         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3322         hdr->itt                = cmd->init_task_tag;
3323         cmd->stat_sn            = conn->stat_sn++;
3324         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3325
3326         iscsit_increment_maxcmdsn(cmd, conn->sess);
3327         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3328         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3329
3330         pr_debug("Built Task Management Response ITT: 0x%08x,"
3331                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3332                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3333 }
3334 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3335
3336 static int
3337 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3338 {
3339         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3340         u32 tx_size = 0;
3341
3342         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3343
3344         cmd->iov_misc[0].iov_base       = cmd->pdu;
3345         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3346         tx_size += ISCSI_HDR_LEN;
3347
3348         if (conn->conn_ops->HeaderDigest) {
3349                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3350
3351                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3352                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3353
3354                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3355                 tx_size += ISCSI_CRC_LEN;
3356                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3357                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3358         }
3359
3360         cmd->iov_misc_count = 1;
3361         cmd->tx_size = tx_size;
3362
3363         return 0;
3364 }
3365
3366 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3367 {
3368         bool ret = false;
3369
3370         if (np->np_sockaddr.ss_family == AF_INET6) {
3371                 const struct sockaddr_in6 sin6 = {
3372                         .sin6_addr = IN6ADDR_ANY_INIT };
3373                 struct sockaddr_in6 *sock_in6 =
3374                          (struct sockaddr_in6 *)&np->np_sockaddr;
3375
3376                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3377                                 sin6.sin6_addr.s6_addr, 16))
3378                         ret = true;
3379         } else {
3380                 struct sockaddr_in * sock_in =
3381                         (struct sockaddr_in *)&np->np_sockaddr;
3382
3383                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3384                         ret = true;
3385         }
3386
3387         return ret;
3388 }
3389
3390 #define SENDTARGETS_BUF_LIMIT 32768U
3391
3392 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3393 {
3394         char *payload = NULL;
3395         struct iscsi_conn *conn = cmd->conn;
3396         struct iscsi_portal_group *tpg;
3397         struct iscsi_tiqn *tiqn;
3398         struct iscsi_tpg_np *tpg_np;
3399         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3400         int target_name_printed;
3401         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3402         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3403
3404         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3405                          SENDTARGETS_BUF_LIMIT);
3406
3407         payload = kzalloc(buffer_len, GFP_KERNEL);
3408         if (!payload) {
3409                 pr_err("Unable to allocate memory for sendtargets"
3410                                 " response.\n");
3411                 return -ENOMEM;
3412         }
3413         /*
3414          * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3415          * explicit case..
3416          */
3417         if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3418                 text_ptr = strchr(text_in, '=');
3419                 if (!text_ptr) {
3420                         pr_err("Unable to locate '=' string in text_in:"
3421                                " %s\n", text_in);
3422                         kfree(payload);
3423                         return -EINVAL;
3424                 }
3425                 /*
3426                  * Skip over '=' character..
3427                  */
3428                 text_ptr += 1;
3429         }
3430
3431         spin_lock(&tiqn_lock);
3432         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3433                 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3434                      strcmp(tiqn->tiqn, text_ptr)) {
3435                         continue;
3436                 }
3437
3438                 target_name_printed = 0;
3439
3440                 spin_lock(&tiqn->tiqn_tpg_lock);
3441                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3442
3443                         /* If demo_mode_discovery=0 and generate_node_acls=0
3444                          * (demo mode dislabed) do not return
3445                          * TargetName+TargetAddress unless a NodeACL exists.
3446                          */
3447
3448                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3449                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3450                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3451                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3452                                 continue;
3453                         }
3454
3455                         spin_lock(&tpg->tpg_state_lock);
3456                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3457                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3458                                 spin_unlock(&tpg->tpg_state_lock);
3459                                 continue;
3460                         }
3461                         spin_unlock(&tpg->tpg_state_lock);
3462
3463                         spin_lock(&tpg->tpg_np_lock);
3464                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3465                                                 tpg_np_list) {
3466                                 struct iscsi_np *np = tpg_np->tpg_np;
3467                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3468
3469                                 if (!target_name_printed) {
3470                                         len = sprintf(buf, "TargetName=%s",
3471                                                       tiqn->tiqn);
3472                                         len += 1;
3473
3474                                         if ((len + payload_len) > buffer_len) {
3475                                                 spin_unlock(&tpg->tpg_np_lock);
3476                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3477                                                 end_of_buf = 1;
3478                                                 goto eob;
3479                                         }
3480                                         memcpy(payload + payload_len, buf, len);
3481                                         payload_len += len;
3482                                         target_name_printed = 1;
3483                                 }
3484
3485                                 len = sprintf(buf, "TargetAddress="
3486                                         "%s:%hu,%hu",
3487                                         (inaddr_any == false) ?
3488                                                 np->np_ip : conn->local_ip,
3489                                         (inaddr_any == false) ?
3490                                                 np->np_port : conn->local_port,
3491                                         tpg->tpgt);
3492                                 len += 1;
3493
3494                                 if ((len + payload_len) > buffer_len) {
3495                                         spin_unlock(&tpg->tpg_np_lock);
3496                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3497                                         end_of_buf = 1;
3498                                         goto eob;
3499                                 }
3500                                 memcpy(payload + payload_len, buf, len);
3501                                 payload_len += len;
3502                         }
3503                         spin_unlock(&tpg->tpg_np_lock);
3504                 }
3505                 spin_unlock(&tiqn->tiqn_tpg_lock);
3506 eob:
3507                 if (end_of_buf)
3508                         break;
3509
3510                 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3511                         break;
3512         }
3513         spin_unlock(&tiqn_lock);
3514
3515         cmd->buf_ptr = payload;
3516
3517         return payload_len;
3518 }
3519
3520 int
3521 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3522                       struct iscsi_text_rsp *hdr)
3523 {
3524         int text_length, padding;
3525
3526         text_length = iscsit_build_sendtargets_response(cmd);
3527         if (text_length < 0)
3528                 return text_length;
3529
3530         hdr->opcode = ISCSI_OP_TEXT_RSP;
3531         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3532         padding = ((-text_length) & 3);
3533         hton24(hdr->dlength, text_length);
3534         hdr->itt = cmd->init_task_tag;
3535         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3536         cmd->stat_sn = conn->stat_sn++;
3537         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3538
3539         iscsit_increment_maxcmdsn(cmd, conn->sess);
3540         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3541         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3542
3543         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3544                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3545                 text_length, conn->cid);
3546
3547         return text_length + padding;
3548 }
3549 EXPORT_SYMBOL(iscsit_build_text_rsp);
3550
3551 /*
3552  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3553  *      MaxRecvDataSegmentLength.
3554  */
3555 static int iscsit_send_text_rsp(
3556         struct iscsi_cmd *cmd,
3557         struct iscsi_conn *conn)
3558 {
3559         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3560         struct kvec *iov;
3561         u32 tx_size = 0;
3562         int text_length, iov_count = 0, rc;
3563
3564         rc = iscsit_build_text_rsp(cmd, conn, hdr);
3565         if (rc < 0)
3566                 return rc;
3567
3568         text_length = rc;
3569         iov = &cmd->iov_misc[0];
3570         iov[iov_count].iov_base = cmd->pdu;
3571         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3572         iov[iov_count].iov_base = cmd->buf_ptr;
3573         iov[iov_count++].iov_len = text_length;
3574
3575         tx_size += (ISCSI_HDR_LEN + text_length);
3576
3577         if (conn->conn_ops->HeaderDigest) {
3578                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3579
3580                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3581                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3582
3583                 iov[0].iov_len += ISCSI_CRC_LEN;
3584                 tx_size += ISCSI_CRC_LEN;
3585                 pr_debug("Attaching CRC32 HeaderDigest for"
3586                         " Text Response PDU 0x%08x\n", *header_digest);
3587         }
3588
3589         if (conn->conn_ops->DataDigest) {
3590                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3591                                 cmd->buf_ptr, text_length,
3592                                 0, NULL, (u8 *)&cmd->data_crc);
3593
3594                 iov[iov_count].iov_base = &cmd->data_crc;
3595                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3596                 tx_size += ISCSI_CRC_LEN;
3597
3598                 pr_debug("Attaching DataDigest for %u bytes of text"
3599                         " data, CRC 0x%08x\n", text_length,
3600                         cmd->data_crc);
3601         }
3602
3603         cmd->iov_misc_count = iov_count;
3604         cmd->tx_size = tx_size;
3605
3606         return 0;
3607 }
3608
3609 void
3610 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3611                     struct iscsi_reject *hdr)
3612 {
3613         hdr->opcode             = ISCSI_OP_REJECT;
3614         hdr->reason             = cmd->reject_reason;
3615         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3616         hton24(hdr->dlength, ISCSI_HDR_LEN);
3617         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3618         cmd->stat_sn            = conn->stat_sn++;
3619         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3620         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3621         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3622
3623 }
3624 EXPORT_SYMBOL(iscsit_build_reject);
3625
3626 static int iscsit_send_reject(
3627         struct iscsi_cmd *cmd,
3628         struct iscsi_conn *conn)
3629 {
3630         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3631         struct kvec *iov;
3632         u32 iov_count = 0, tx_size;
3633
3634         iscsit_build_reject(cmd, conn, hdr);
3635
3636         iov = &cmd->iov_misc[0];
3637         iov[iov_count].iov_base = cmd->pdu;
3638         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3639         iov[iov_count].iov_base = cmd->buf_ptr;
3640         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3641
3642         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3643
3644         if (conn->conn_ops->HeaderDigest) {
3645                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3646
3647                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3648                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3649
3650                 iov[0].iov_len += ISCSI_CRC_LEN;
3651                 tx_size += ISCSI_CRC_LEN;
3652                 pr_debug("Attaching CRC32 HeaderDigest for"
3653                         " REJECT PDU 0x%08x\n", *header_digest);
3654         }
3655
3656         if (conn->conn_ops->DataDigest) {
3657                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3658                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3659
3660                 iov[iov_count].iov_base = &cmd->data_crc;
3661                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3662                 tx_size += ISCSI_CRC_LEN;
3663                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3664                                 " PDU 0x%08x\n", cmd->data_crc);
3665         }
3666
3667         cmd->iov_misc_count = iov_count;
3668         cmd->tx_size = tx_size;
3669
3670         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3671                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3672
3673         return 0;
3674 }
3675
3676 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3677 {
3678         struct iscsi_thread_set *ts = conn->thread_set;
3679         int ord, cpu;
3680         /*
3681          * thread_id is assigned from iscsit_global->ts_bitmap from
3682          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3683          *
3684          * Here we use thread_id to determine which CPU that this
3685          * iSCSI connection's iscsi_thread_set will be scheduled to
3686          * execute upon.
3687          */
3688         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3689         for_each_online_cpu(cpu) {
3690                 if (ord-- == 0) {
3691                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3692                         return;
3693                 }
3694         }
3695         /*
3696          * This should never be reached..
3697          */
3698         dump_stack();
3699         cpumask_setall(conn->conn_cpumask);
3700 }
3701
3702 static inline void iscsit_thread_check_cpumask(
3703         struct iscsi_conn *conn,
3704         struct task_struct *p,
3705         int mode)
3706 {
3707         char buf[128];
3708         /*
3709          * mode == 1 signals iscsi_target_tx_thread() usage.
3710          * mode == 0 signals iscsi_target_rx_thread() usage.
3711          */
3712         if (mode == 1) {
3713                 if (!conn->conn_tx_reset_cpumask)
3714                         return;
3715                 conn->conn_tx_reset_cpumask = 0;
3716         } else {
3717                 if (!conn->conn_rx_reset_cpumask)
3718                         return;
3719                 conn->conn_rx_reset_cpumask = 0;
3720         }
3721         /*
3722          * Update the CPU mask for this single kthread so that
3723          * both TX and RX kthreads are scheduled to run on the
3724          * same CPU.
3725          */
3726         memset(buf, 0, 128);
3727         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3728         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3729 }
3730
3731 static int
3732 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3733 {
3734         int ret;
3735
3736         switch (state) {
3737         case ISTATE_SEND_R2T:
3738                 ret = iscsit_send_r2t(cmd, conn);
3739                 if (ret < 0)
3740                         goto err;
3741                 break;
3742         case ISTATE_REMOVE:
3743                 spin_lock_bh(&conn->cmd_lock);
3744                 list_del_init(&cmd->i_conn_node);
3745                 spin_unlock_bh(&conn->cmd_lock);
3746
3747                 iscsit_free_cmd(cmd, false);
3748                 break;
3749         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3750                 iscsit_mod_nopin_response_timer(conn);
3751                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3752                 if (ret < 0)
3753                         goto err;
3754                 break;
3755         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3756                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3757                 if (ret < 0)
3758                         goto err;
3759                 break;
3760         default:
3761                 pr_err("Unknown Opcode: 0x%02x ITT:"
3762                        " 0x%08x, i_state: %d on CID: %hu\n",
3763                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3764                        conn->cid);
3765                 goto err;
3766         }
3767
3768         return 0;
3769
3770 err:
3771         return -1;
3772 }
3773
3774 static int
3775 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3776 {
3777         struct iscsit_transport *t = conn->conn_transport;
3778         struct iscsi_queue_req *qr;
3779         struct iscsi_cmd *cmd;
3780         u8 state;
3781         int ret;
3782
3783         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3784                 atomic_set(&conn->check_immediate_queue, 0);
3785                 cmd = qr->cmd;
3786                 state = qr->state;
3787                 kmem_cache_free(lio_qr_cache, qr);
3788
3789                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3790                 if (ret < 0)
3791                         return ret;
3792         }
3793
3794         return 0;
3795 }
3796
3797 static int
3798 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3799 {
3800         int ret;
3801
3802 check_rsp_state:
3803         switch (state) {
3804         case ISTATE_SEND_DATAIN:
3805                 ret = iscsit_send_datain(cmd, conn);
3806                 if (ret < 0)
3807                         goto err;
3808                 else if (!ret)
3809                         /* more drs */
3810                         goto check_rsp_state;
3811                 else if (ret == 1) {
3812                         /* all done */
3813                         spin_lock_bh(&cmd->istate_lock);
3814                         cmd->i_state = ISTATE_SENT_STATUS;
3815                         spin_unlock_bh(&cmd->istate_lock);
3816
3817                         if (atomic_read(&conn->check_immediate_queue))
3818                                 return 1;
3819
3820                         return 0;
3821                 } else if (ret == 2) {
3822                         /* Still must send status,
3823                            SCF_TRANSPORT_TASK_SENSE was set */
3824                         spin_lock_bh(&cmd->istate_lock);
3825                         cmd->i_state = ISTATE_SEND_STATUS;
3826                         spin_unlock_bh(&cmd->istate_lock);
3827                         state = ISTATE_SEND_STATUS;
3828                         goto check_rsp_state;
3829                 }
3830
3831                 break;
3832         case ISTATE_SEND_STATUS:
3833         case ISTATE_SEND_STATUS_RECOVERY:
3834                 ret = iscsit_send_response(cmd, conn);
3835                 break;
3836         case ISTATE_SEND_LOGOUTRSP:
3837                 ret = iscsit_send_logout(cmd, conn);
3838                 break;
3839         case ISTATE_SEND_ASYNCMSG:
3840                 ret = iscsit_send_conn_drop_async_message(
3841                         cmd, conn);
3842                 break;
3843         case ISTATE_SEND_NOPIN:
3844                 ret = iscsit_send_nopin(cmd, conn);
3845                 break;
3846         case ISTATE_SEND_REJECT:
3847                 ret = iscsit_send_reject(cmd, conn);
3848                 break;
3849         case ISTATE_SEND_TASKMGTRSP:
3850                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3851                 if (ret != 0)
3852                         break;
3853                 ret = iscsit_tmr_post_handler(cmd, conn);
3854                 if (ret != 0)
3855                         iscsit_fall_back_to_erl0(conn->sess);
3856                 break;
3857         case ISTATE_SEND_TEXTRSP:
3858                 ret = iscsit_send_text_rsp(cmd, conn);
3859                 break;
3860         default:
3861                 pr_err("Unknown Opcode: 0x%02x ITT:"
3862                        " 0x%08x, i_state: %d on CID: %hu\n",
3863                        cmd->iscsi_opcode, cmd->init_task_tag,
3864                        state, conn->cid);
3865                 goto err;
3866         }
3867         if (ret < 0)
3868                 goto err;
3869
3870         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3871                 iscsit_tx_thread_wait_for_tcp(conn);
3872                 iscsit_unmap_iovec(cmd);
3873                 goto err;
3874         }
3875         iscsit_unmap_iovec(cmd);
3876
3877         switch (state) {
3878         case ISTATE_SEND_LOGOUTRSP:
3879                 if (!iscsit_logout_post_handler(cmd, conn))
3880                         goto restart;
3881                 /* fall through */
3882         case ISTATE_SEND_STATUS:
3883         case ISTATE_SEND_ASYNCMSG:
3884         case ISTATE_SEND_NOPIN:
3885         case ISTATE_SEND_STATUS_RECOVERY:
3886         case ISTATE_SEND_TEXTRSP:
3887         case ISTATE_SEND_TASKMGTRSP:
3888         case ISTATE_SEND_REJECT:
3889                 spin_lock_bh(&cmd->istate_lock);
3890                 cmd->i_state = ISTATE_SENT_STATUS;
3891                 spin_unlock_bh(&cmd->istate_lock);
3892                 break;
3893         default:
3894                 pr_err("Unknown Opcode: 0x%02x ITT:"
3895                        " 0x%08x, i_state: %d on CID: %hu\n",
3896                        cmd->iscsi_opcode, cmd->init_task_tag,
3897                        cmd->i_state, conn->cid);
3898                 goto err;
3899         }
3900
3901         if (atomic_read(&conn->check_immediate_queue))
3902                 return 1;
3903
3904         return 0;
3905
3906 err:
3907         return -1;
3908 restart:
3909         return -EAGAIN;
3910 }
3911
3912 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3913 {
3914         struct iscsit_transport *t = conn->conn_transport;
3915         struct iscsi_queue_req *qr;
3916         struct iscsi_cmd *cmd;
3917         u8 state;
3918         int ret;
3919
3920         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3921                 cmd = qr->cmd;
3922                 state = qr->state;
3923                 kmem_cache_free(lio_qr_cache, qr);
3924
3925                 ret = t->iscsit_response_queue(conn, cmd, state);
3926                 if (ret == 1 || ret < 0)
3927                         return ret;
3928         }
3929
3930         return 0;
3931 }
3932
3933 int iscsi_target_tx_thread(void *arg)
3934 {
3935         int ret = 0;
3936         struct iscsi_conn *conn;
3937         struct iscsi_thread_set *ts = arg;
3938         /*
3939          * Allow ourselves to be interrupted by SIGINT so that a
3940          * connection recovery / failure event can be triggered externally.
3941          */
3942         allow_signal(SIGINT);
3943
3944 restart:
3945         conn = iscsi_tx_thread_pre_handler(ts);
3946         if (!conn)
3947                 goto out;
3948
3949         ret = 0;
3950
3951         while (!kthread_should_stop()) {
3952                 /*
3953                  * Ensure that both TX and RX per connection kthreads
3954                  * are scheduled to run on the same CPU.
3955                  */
3956                 iscsit_thread_check_cpumask(conn, current, 1);
3957
3958                 wait_event_interruptible(conn->queues_wq,
3959                                          !iscsit_conn_all_queues_empty(conn) ||
3960                                          ts->status == ISCSI_THREAD_SET_RESET);
3961
3962                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3963                      signal_pending(current))
3964                         goto transport_err;
3965
3966 get_immediate:
3967                 ret = iscsit_handle_immediate_queue(conn);
3968                 if (ret < 0)
3969                         goto transport_err;
3970
3971                 ret = iscsit_handle_response_queue(conn);
3972                 if (ret == 1)
3973                         goto get_immediate;
3974                 else if (ret == -EAGAIN)
3975                         goto restart;
3976                 else if (ret < 0)
3977                         goto transport_err;
3978         }
3979
3980 transport_err:
3981         iscsit_take_action_for_connection_exit(conn);
3982         goto restart;
3983 out:
3984         return 0;
3985 }
3986
3987 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3988 {
3989         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3990         struct iscsi_cmd *cmd;
3991         int ret = 0;
3992
3993         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3994         case ISCSI_OP_SCSI_CMD:
3995                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3996                 if (!cmd)
3997                         goto reject;
3998
3999                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4000                 break;
4001         case ISCSI_OP_SCSI_DATA_OUT:
4002                 ret = iscsit_handle_data_out(conn, buf);
4003                 break;
4004         case ISCSI_OP_NOOP_OUT:
4005                 cmd = NULL;
4006                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4007                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4008                         if (!cmd)
4009                                 goto reject;
4010                 }
4011                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4012                 break;
4013         case ISCSI_OP_SCSI_TMFUNC:
4014                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4015                 if (!cmd)
4016                         goto reject;
4017
4018                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4019                 break;
4020         case ISCSI_OP_TEXT:
4021                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4022                 if (!cmd)
4023                         goto reject;
4024
4025                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4026                 break;
4027         case ISCSI_OP_LOGOUT:
4028                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4029                 if (!cmd)
4030                         goto reject;
4031
4032                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4033                 if (ret > 0)
4034                         wait_for_completion_timeout(&conn->conn_logout_comp,
4035                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4036                 break;
4037         case ISCSI_OP_SNACK:
4038                 ret = iscsit_handle_snack(conn, buf);
4039                 break;
4040         default:
4041                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4042                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4043                         pr_err("Cannot recover from unknown"
4044                         " opcode while ERL=0, closing iSCSI connection.\n");
4045                         return -1;
4046                 }
4047                 if (!conn->conn_ops->OFMarker) {
4048                         pr_err("Unable to recover from unknown"
4049                         " opcode while OFMarker=No, closing iSCSI"
4050                                 " connection.\n");
4051                         return -1;
4052                 }
4053                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4054                         pr_err("Unable to recover from unknown"
4055                                 " opcode, closing iSCSI connection.\n");
4056                         return -1;
4057                 }
4058                 break;
4059         }
4060
4061         return ret;
4062 reject:
4063         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4064 }
4065
4066 int iscsi_target_rx_thread(void *arg)
4067 {
4068         int ret;
4069         u8 buffer[ISCSI_HDR_LEN], opcode;
4070         u32 checksum = 0, digest = 0;
4071         struct iscsi_conn *conn = NULL;
4072         struct iscsi_thread_set *ts = arg;
4073         struct kvec iov;
4074         /*
4075          * Allow ourselves to be interrupted by SIGINT so that a
4076          * connection recovery / failure event can be triggered externally.
4077          */
4078         allow_signal(SIGINT);
4079
4080 restart:
4081         conn = iscsi_rx_thread_pre_handler(ts);
4082         if (!conn)
4083                 goto out;
4084
4085         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4086                 struct completion comp;
4087                 int rc;
4088
4089                 init_completion(&comp);
4090                 rc = wait_for_completion_interruptible(&comp);
4091                 if (rc < 0)
4092                         goto transport_err;
4093
4094                 goto out;
4095         }
4096
4097         while (!kthread_should_stop()) {
4098                 /*
4099                  * Ensure that both TX and RX per connection kthreads
4100                  * are scheduled to run on the same CPU.
4101                  */
4102                 iscsit_thread_check_cpumask(conn, current, 0);
4103
4104                 memset(buffer, 0, ISCSI_HDR_LEN);
4105                 memset(&iov, 0, sizeof(struct kvec));
4106
4107                 iov.iov_base    = buffer;
4108                 iov.iov_len     = ISCSI_HDR_LEN;
4109
4110                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4111                 if (ret != ISCSI_HDR_LEN) {
4112                         iscsit_rx_thread_wait_for_tcp(conn);
4113                         goto transport_err;
4114                 }
4115
4116                 if (conn->conn_ops->HeaderDigest) {
4117                         iov.iov_base    = &digest;
4118                         iov.iov_len     = ISCSI_CRC_LEN;
4119
4120                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4121                         if (ret != ISCSI_CRC_LEN) {
4122                                 iscsit_rx_thread_wait_for_tcp(conn);
4123                                 goto transport_err;
4124                         }
4125
4126                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4127                                         buffer, ISCSI_HDR_LEN,
4128                                         0, NULL, (u8 *)&checksum);
4129
4130                         if (digest != checksum) {
4131                                 pr_err("HeaderDigest CRC32C failed,"
4132                                         " received 0x%08x, computed 0x%08x\n",
4133                                         digest, checksum);
4134                                 /*
4135                                  * Set the PDU to 0xff so it will intentionally
4136                                  * hit default in the switch below.
4137                                  */
4138                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4139                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4140                         } else {
4141                                 pr_debug("Got HeaderDigest CRC32C"
4142                                                 " 0x%08x\n", checksum);
4143                         }
4144                 }
4145
4146                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4147                         goto transport_err;
4148
4149                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4150
4151                 if (conn->sess->sess_ops->SessionType &&
4152                    ((!(opcode & ISCSI_OP_TEXT)) ||
4153                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4154                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4155                         " while in Discovery Session, rejecting.\n", opcode);
4156                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4157                                           buffer);
4158                         goto transport_err;
4159                 }
4160
4161                 ret = iscsi_target_rx_opcode(conn, buffer);
4162                 if (ret < 0)
4163                         goto transport_err;
4164         }
4165
4166 transport_err:
4167         if (!signal_pending(current))
4168                 atomic_set(&conn->transport_failed, 1);
4169         iscsit_take_action_for_connection_exit(conn);
4170         goto restart;
4171 out:
4172         return 0;
4173 }
4174
4175 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4176 {
4177         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4178         struct iscsi_session *sess = conn->sess;
4179         /*
4180          * We expect this function to only ever be called from either RX or TX
4181          * thread context via iscsit_close_connection() once the other context
4182          * has been reset -> returned sleeping pre-handler state.
4183          */
4184         spin_lock_bh(&conn->cmd_lock);
4185         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4186
4187                 list_del_init(&cmd->i_conn_node);
4188                 spin_unlock_bh(&conn->cmd_lock);
4189
4190                 iscsit_increment_maxcmdsn(cmd, sess);
4191
4192                 iscsit_free_cmd(cmd, true);
4193
4194                 spin_lock_bh(&conn->cmd_lock);
4195         }
4196         spin_unlock_bh(&conn->cmd_lock);
4197 }
4198
4199 static void iscsit_stop_timers_for_cmds(
4200         struct iscsi_conn *conn)
4201 {
4202         struct iscsi_cmd *cmd;
4203
4204         spin_lock_bh(&conn->cmd_lock);
4205         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4206                 if (cmd->data_direction == DMA_TO_DEVICE)
4207                         iscsit_stop_dataout_timer(cmd);
4208         }
4209         spin_unlock_bh(&conn->cmd_lock);
4210 }
4211
4212 int iscsit_close_connection(
4213         struct iscsi_conn *conn)
4214 {
4215         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4216         struct iscsi_session    *sess = conn->sess;
4217
4218         pr_debug("Closing iSCSI connection CID %hu on SID:"
4219                 " %u\n", conn->cid, sess->sid);
4220         /*
4221          * Always up conn_logout_comp just in case the RX Thread is sleeping
4222          * and the logout response never got sent because the connection
4223          * failed.
4224          */
4225         complete(&conn->conn_logout_comp);
4226
4227         iscsi_release_thread_set(conn);
4228
4229         iscsit_stop_timers_for_cmds(conn);
4230         iscsit_stop_nopin_response_timer(conn);
4231         iscsit_stop_nopin_timer(conn);
4232
4233         if (conn->conn_transport->iscsit_wait_conn)
4234                 conn->conn_transport->iscsit_wait_conn(conn);
4235
4236         iscsit_free_queue_reqs_for_conn(conn);
4237
4238         /*
4239          * During Connection recovery drop unacknowledged out of order
4240          * commands for this connection, and prepare the other commands
4241          * for realligence.
4242          *
4243          * During normal operation clear the out of order commands (but
4244          * do not free the struct iscsi_ooo_cmdsn's) and release all
4245          * struct iscsi_cmds.
4246          */
4247         if (atomic_read(&conn->connection_recovery)) {
4248                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4249                 iscsit_prepare_cmds_for_realligance(conn);
4250         } else {
4251                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4252                 iscsit_release_commands_from_conn(conn);
4253         }
4254
4255         /*
4256          * Handle decrementing session or connection usage count if
4257          * a logout response was not able to be sent because the
4258          * connection failed.  Fall back to Session Recovery here.
4259          */
4260         if (atomic_read(&conn->conn_logout_remove)) {
4261                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4262                         iscsit_dec_conn_usage_count(conn);
4263                         iscsit_dec_session_usage_count(sess);
4264                 }
4265                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4266                         iscsit_dec_conn_usage_count(conn);
4267
4268                 atomic_set(&conn->conn_logout_remove, 0);
4269                 atomic_set(&sess->session_reinstatement, 0);
4270                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4271         }
4272
4273         spin_lock_bh(&sess->conn_lock);
4274         list_del(&conn->conn_list);
4275
4276         /*
4277          * Attempt to let the Initiator know this connection failed by
4278          * sending an Connection Dropped Async Message on another
4279          * active connection.
4280          */
4281         if (atomic_read(&conn->connection_recovery))
4282                 iscsit_build_conn_drop_async_message(conn);
4283
4284         spin_unlock_bh(&sess->conn_lock);
4285
4286         /*
4287          * If connection reinstatement is being performed on this connection,
4288          * up the connection reinstatement semaphore that is being blocked on
4289          * in iscsit_cause_connection_reinstatement().
4290          */
4291         spin_lock_bh(&conn->state_lock);
4292         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4293                 spin_unlock_bh(&conn->state_lock);
4294                 complete(&conn->conn_wait_comp);
4295                 wait_for_completion(&conn->conn_post_wait_comp);
4296                 spin_lock_bh(&conn->state_lock);
4297         }
4298
4299         /*
4300          * If connection reinstatement is being performed on this connection
4301          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4302          * connection wait rcfr semaphore that is being blocked on
4303          * an iscsit_connection_reinstatement_rcfr().
4304          */
4305         if (atomic_read(&conn->connection_wait_rcfr)) {
4306                 spin_unlock_bh(&conn->state_lock);
4307                 complete(&conn->conn_wait_rcfr_comp);
4308                 wait_for_completion(&conn->conn_post_wait_comp);
4309                 spin_lock_bh(&conn->state_lock);
4310         }
4311         atomic_set(&conn->connection_reinstatement, 1);
4312         spin_unlock_bh(&conn->state_lock);
4313
4314         /*
4315          * If any other processes are accessing this connection pointer we
4316          * must wait until they have completed.
4317          */
4318         iscsit_check_conn_usage_count(conn);
4319
4320         if (conn->conn_rx_hash.tfm)
4321                 crypto_free_hash(conn->conn_rx_hash.tfm);
4322         if (conn->conn_tx_hash.tfm)
4323                 crypto_free_hash(conn->conn_tx_hash.tfm);
4324
4325         if (conn->conn_cpumask)
4326                 free_cpumask_var(conn->conn_cpumask);
4327
4328         kfree(conn->conn_ops);
4329         conn->conn_ops = NULL;
4330
4331         if (conn->sock)
4332                 sock_release(conn->sock);
4333
4334         if (conn->conn_transport->iscsit_free_conn)
4335                 conn->conn_transport->iscsit_free_conn(conn);
4336
4337         iscsit_put_transport(conn->conn_transport);
4338
4339         conn->thread_set = NULL;
4340
4341         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4342         conn->conn_state = TARG_CONN_STATE_FREE;
4343         kfree(conn);
4344
4345         spin_lock_bh(&sess->conn_lock);
4346         atomic_dec(&sess->nconn);
4347         pr_debug("Decremented iSCSI connection count to %hu from node:"
4348                 " %s\n", atomic_read(&sess->nconn),
4349                 sess->sess_ops->InitiatorName);
4350         /*
4351          * Make sure that if one connection fails in an non ERL=2 iSCSI
4352          * Session that they all fail.
4353          */
4354         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4355              !atomic_read(&sess->session_logout))
4356                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4357
4358         /*
4359          * If this was not the last connection in the session, and we are
4360          * performing session reinstatement or falling back to ERL=0, call
4361          * iscsit_stop_session() without sleeping to shutdown the other
4362          * active connections.
4363          */
4364         if (atomic_read(&sess->nconn)) {
4365                 if (!atomic_read(&sess->session_reinstatement) &&
4366                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4367                         spin_unlock_bh(&sess->conn_lock);
4368                         return 0;
4369                 }
4370                 if (!atomic_read(&sess->session_stop_active)) {
4371                         atomic_set(&sess->session_stop_active, 1);
4372                         spin_unlock_bh(&sess->conn_lock);
4373                         iscsit_stop_session(sess, 0, 0);
4374                         return 0;
4375                 }
4376                 spin_unlock_bh(&sess->conn_lock);
4377                 return 0;
4378         }
4379
4380         /*
4381          * If this was the last connection in the session and one of the
4382          * following is occurring:
4383          *
4384          * Session Reinstatement is not being performed, and are falling back
4385          * to ERL=0 call iscsit_close_session().
4386          *
4387          * Session Logout was requested.  iscsit_close_session() will be called
4388          * elsewhere.
4389          *
4390          * Session Continuation is not being performed, start the Time2Retain
4391          * handler and check if sleep_on_sess_wait_sem is active.
4392          */
4393         if (!atomic_read(&sess->session_reinstatement) &&
4394              atomic_read(&sess->session_fall_back_to_erl0)) {
4395                 spin_unlock_bh(&sess->conn_lock);
4396                 target_put_session(sess->se_sess);
4397
4398                 return 0;
4399         } else if (atomic_read(&sess->session_logout)) {
4400                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4401                 sess->session_state = TARG_SESS_STATE_FREE;
4402                 spin_unlock_bh(&sess->conn_lock);
4403
4404                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4405                         complete(&sess->session_wait_comp);
4406
4407                 return 0;
4408         } else {
4409                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4410                 sess->session_state = TARG_SESS_STATE_FAILED;
4411
4412                 if (!atomic_read(&sess->session_continuation)) {
4413                         spin_unlock_bh(&sess->conn_lock);
4414                         iscsit_start_time2retain_handler(sess);
4415                 } else
4416                         spin_unlock_bh(&sess->conn_lock);
4417
4418                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4419                         complete(&sess->session_wait_comp);
4420
4421                 return 0;
4422         }
4423         spin_unlock_bh(&sess->conn_lock);
4424
4425         return 0;
4426 }
4427
4428 int iscsit_close_session(struct iscsi_session *sess)
4429 {
4430         struct iscsi_portal_group *tpg = sess->tpg;
4431         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4432
4433         if (atomic_read(&sess->nconn)) {
4434                 pr_err("%d connection(s) still exist for iSCSI session"
4435                         " to %s\n", atomic_read(&sess->nconn),
4436                         sess->sess_ops->InitiatorName);
4437                 BUG();
4438         }
4439
4440         spin_lock_bh(&se_tpg->session_lock);
4441         atomic_set(&sess->session_logout, 1);
4442         atomic_set(&sess->session_reinstatement, 1);
4443         iscsit_stop_time2retain_timer(sess);
4444         spin_unlock_bh(&se_tpg->session_lock);
4445
4446         /*
4447          * transport_deregister_session_configfs() will clear the
4448          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4449          * can be setting it again with __transport_register_session() in
4450          * iscsi_post_login_handler() again after the iscsit_stop_session()
4451          * completes in iscsi_np context.
4452          */
4453         transport_deregister_session_configfs(sess->se_sess);
4454
4455         /*
4456          * If any other processes are accessing this session pointer we must
4457          * wait until they have completed.  If we are in an interrupt (the
4458          * time2retain handler) and contain and active session usage count we
4459          * restart the timer and exit.
4460          */
4461         if (!in_interrupt()) {
4462                 if (iscsit_check_session_usage_count(sess) == 1)
4463                         iscsit_stop_session(sess, 1, 1);
4464         } else {
4465                 if (iscsit_check_session_usage_count(sess) == 2) {
4466                         atomic_set(&sess->session_logout, 0);
4467                         iscsit_start_time2retain_handler(sess);
4468                         return 0;
4469                 }
4470         }
4471
4472         transport_deregister_session(sess->se_sess);
4473
4474         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4475                 iscsit_free_connection_recovery_entires(sess);
4476
4477         iscsit_free_all_ooo_cmdsns(sess);
4478
4479         spin_lock_bh(&se_tpg->session_lock);
4480         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4481         sess->session_state = TARG_SESS_STATE_FREE;
4482         pr_debug("Released iSCSI session from node: %s\n",
4483                         sess->sess_ops->InitiatorName);
4484         tpg->nsessions--;
4485         if (tpg->tpg_tiqn)
4486                 tpg->tpg_tiqn->tiqn_nsessions--;
4487
4488         pr_debug("Decremented number of active iSCSI Sessions on"
4489                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4490
4491         spin_lock(&sess_idr_lock);
4492         idr_remove(&sess_idr, sess->session_index);
4493         spin_unlock(&sess_idr_lock);
4494
4495         kfree(sess->sess_ops);
4496         sess->sess_ops = NULL;
4497         spin_unlock_bh(&se_tpg->session_lock);
4498
4499         kfree(sess);
4500         return 0;
4501 }
4502
4503 static void iscsit_logout_post_handler_closesession(
4504         struct iscsi_conn *conn)
4505 {
4506         struct iscsi_session *sess = conn->sess;
4507
4508         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4509         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4510
4511         atomic_set(&conn->conn_logout_remove, 0);
4512         complete(&conn->conn_logout_comp);
4513
4514         iscsit_dec_conn_usage_count(conn);
4515         iscsit_stop_session(sess, 1, 1);
4516         iscsit_dec_session_usage_count(sess);
4517         target_put_session(sess->se_sess);
4518 }
4519
4520 static void iscsit_logout_post_handler_samecid(
4521         struct iscsi_conn *conn)
4522 {
4523         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4524         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4525
4526         atomic_set(&conn->conn_logout_remove, 0);
4527         complete(&conn->conn_logout_comp);
4528
4529         iscsit_cause_connection_reinstatement(conn, 1);
4530         iscsit_dec_conn_usage_count(conn);
4531 }
4532
4533 static void iscsit_logout_post_handler_diffcid(
4534         struct iscsi_conn *conn,
4535         u16 cid)
4536 {
4537         struct iscsi_conn *l_conn;
4538         struct iscsi_session *sess = conn->sess;
4539
4540         if (!sess)
4541                 return;
4542
4543         spin_lock_bh(&sess->conn_lock);
4544         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4545                 if (l_conn->cid == cid) {
4546                         iscsit_inc_conn_usage_count(l_conn);
4547                         break;
4548                 }
4549         }
4550         spin_unlock_bh(&sess->conn_lock);
4551
4552         if (!l_conn)
4553                 return;
4554
4555         if (l_conn->sock)
4556                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4557
4558         spin_lock_bh(&l_conn->state_lock);
4559         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4560         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4561         spin_unlock_bh(&l_conn->state_lock);
4562
4563         iscsit_cause_connection_reinstatement(l_conn, 1);
4564         iscsit_dec_conn_usage_count(l_conn);
4565 }
4566
4567 /*
4568  *      Return of 0 causes the TX thread to restart.
4569  */
4570 int iscsit_logout_post_handler(
4571         struct iscsi_cmd *cmd,
4572         struct iscsi_conn *conn)
4573 {
4574         int ret = 0;
4575
4576         switch (cmd->logout_reason) {
4577         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4578                 switch (cmd->logout_response) {
4579                 case ISCSI_LOGOUT_SUCCESS:
4580                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4581                 default:
4582                         iscsit_logout_post_handler_closesession(conn);
4583                         break;
4584                 }
4585                 ret = 0;
4586                 break;
4587         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4588                 if (conn->cid == cmd->logout_cid) {
4589                         switch (cmd->logout_response) {
4590                         case ISCSI_LOGOUT_SUCCESS:
4591                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4592                         default:
4593                                 iscsit_logout_post_handler_samecid(conn);
4594                                 break;
4595                         }
4596                         ret = 0;
4597                 } else {
4598                         switch (cmd->logout_response) {
4599                         case ISCSI_LOGOUT_SUCCESS:
4600                                 iscsit_logout_post_handler_diffcid(conn,
4601                                         cmd->logout_cid);
4602                                 break;
4603                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4604                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4605                         default:
4606                                 break;
4607                         }
4608                         ret = 1;
4609                 }
4610                 break;
4611         case ISCSI_LOGOUT_REASON_RECOVERY:
4612                 switch (cmd->logout_response) {
4613                 case ISCSI_LOGOUT_SUCCESS:
4614                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4615                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4616                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4617                 default:
4618                         break;
4619                 }
4620                 ret = 1;
4621                 break;
4622         default:
4623                 break;
4624
4625         }
4626         return ret;
4627 }
4628 EXPORT_SYMBOL(iscsit_logout_post_handler);
4629
4630 void iscsit_fail_session(struct iscsi_session *sess)
4631 {
4632         struct iscsi_conn *conn;
4633
4634         spin_lock_bh(&sess->conn_lock);
4635         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4636                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4637                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4638         }
4639         spin_unlock_bh(&sess->conn_lock);
4640
4641         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4642         sess->session_state = TARG_SESS_STATE_FAILED;
4643 }
4644
4645 int iscsit_free_session(struct iscsi_session *sess)
4646 {
4647         u16 conn_count = atomic_read(&sess->nconn);
4648         struct iscsi_conn *conn, *conn_tmp = NULL;
4649         int is_last;
4650
4651         spin_lock_bh(&sess->conn_lock);
4652         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4653
4654         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4655                         conn_list) {
4656                 if (conn_count == 0)
4657                         break;
4658
4659                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4660                         is_last = 1;
4661                 } else {
4662                         iscsit_inc_conn_usage_count(conn_tmp);
4663                         is_last = 0;
4664                 }
4665                 iscsit_inc_conn_usage_count(conn);
4666
4667                 spin_unlock_bh(&sess->conn_lock);
4668                 iscsit_cause_connection_reinstatement(conn, 1);
4669                 spin_lock_bh(&sess->conn_lock);
4670
4671                 iscsit_dec_conn_usage_count(conn);
4672                 if (is_last == 0)
4673                         iscsit_dec_conn_usage_count(conn_tmp);
4674
4675                 conn_count--;
4676         }
4677
4678         if (atomic_read(&sess->nconn)) {
4679                 spin_unlock_bh(&sess->conn_lock);
4680                 wait_for_completion(&sess->session_wait_comp);
4681         } else
4682                 spin_unlock_bh(&sess->conn_lock);
4683
4684         target_put_session(sess->se_sess);
4685         return 0;
4686 }
4687
4688 void iscsit_stop_session(
4689         struct iscsi_session *sess,
4690         int session_sleep,
4691         int connection_sleep)
4692 {
4693         u16 conn_count = atomic_read(&sess->nconn);
4694         struct iscsi_conn *conn, *conn_tmp = NULL;
4695         int is_last;
4696
4697         spin_lock_bh(&sess->conn_lock);
4698         if (session_sleep)
4699                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4700
4701         if (connection_sleep) {
4702                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4703                                 conn_list) {
4704                         if (conn_count == 0)
4705                                 break;
4706
4707                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4708                                 is_last = 1;
4709                         } else {
4710                                 iscsit_inc_conn_usage_count(conn_tmp);
4711                                 is_last = 0;
4712                         }
4713                         iscsit_inc_conn_usage_count(conn);
4714
4715                         spin_unlock_bh(&sess->conn_lock);
4716                         iscsit_cause_connection_reinstatement(conn, 1);
4717                         spin_lock_bh(&sess->conn_lock);
4718
4719                         iscsit_dec_conn_usage_count(conn);
4720                         if (is_last == 0)
4721                                 iscsit_dec_conn_usage_count(conn_tmp);
4722                         conn_count--;
4723                 }
4724         } else {
4725                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4726                         iscsit_cause_connection_reinstatement(conn, 0);
4727         }
4728
4729         if (session_sleep && atomic_read(&sess->nconn)) {
4730                 spin_unlock_bh(&sess->conn_lock);
4731                 wait_for_completion(&sess->session_wait_comp);
4732         } else
4733                 spin_unlock_bh(&sess->conn_lock);
4734 }
4735
4736 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4737 {
4738         struct iscsi_session *sess;
4739         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4740         struct se_session *se_sess, *se_sess_tmp;
4741         int session_count = 0;
4742
4743         spin_lock_bh(&se_tpg->session_lock);
4744         if (tpg->nsessions && !force) {
4745                 spin_unlock_bh(&se_tpg->session_lock);
4746                 return -1;
4747         }
4748
4749         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4750                         sess_list) {
4751                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4752
4753                 spin_lock(&sess->conn_lock);
4754                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4755                     atomic_read(&sess->session_logout) ||
4756                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4757                         spin_unlock(&sess->conn_lock);
4758                         continue;
4759                 }
4760                 atomic_set(&sess->session_reinstatement, 1);
4761                 spin_unlock(&sess->conn_lock);
4762                 spin_unlock_bh(&se_tpg->session_lock);
4763
4764                 iscsit_free_session(sess);
4765                 spin_lock_bh(&se_tpg->session_lock);
4766
4767                 session_count++;
4768         }
4769         spin_unlock_bh(&se_tpg->session_lock);
4770
4771         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4772                         " Group: %hu\n", session_count, tpg->tpgt);
4773         return 0;
4774 }
4775
4776 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4777 MODULE_VERSION("4.1.x");
4778 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4779 MODULE_LICENSE("GPL");
4780
4781 module_init(iscsi_target_init_module);
4782 module_exit(iscsi_target_cleanup_module);